Rifle Parts
Whether you're building a new rifle from scratch or looking to upgrade an existing firearm, our vast selection of rifle parts has everything you are going to need in that journey. At Rainier Arms' selection of rifle parts, you can find a wide variety of products including lower and upper parts, trigger parts, muzzle devices, and many more.
Explore our selection of high-quality parts coming from various leading manufacturers like Strike Industries, Magpul, BCM, and many more.
Also, don't forget to check our specially-made Rainier Arms barrels for your firearms.
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Shopping Options
Barrel Length
- 3.1" 1 item
- 3.66" 1 item
- 4" 5 items
- 4.5" 2 items
- 5" 5 items
- 5.25" 2 items
- 5.5" 15 items
- 6" 9 items
- 6.5" 3 items
- 6.75" 1 item
- 7" 4 items
- 7.25" 1 item
- 7.5" 11 items
- 7.75" 2 items
- 7.94" 1 item
- 8" 13 items
- 8.3" 4 items
- 8.5" 14 items
- 8.75" 1 item
- 9" 5 items
- 9.5" 1 item
- 9.75" 1 item
- 10" 3 items
- 10.3" 17 items
- 10.5" 42 items
- 10.7" 5 items
- 11" 1 item
- 11.5" 19 items
- 11.85" 2 items
- 12" 9 items
- 12.3" 1 item
- 12.5" 22 items
- 13" 3 items
- 13.5" 1 item
- 13.7" 9 items
- 13.9" 6 items
- 14.5" 37 items
- 16" 129 items
- 16.1" 5 items
- 16.3" 2 items
- 17" 1 item
- 18" 82 items
- 20" 35 items
- 20.5" 1 item
- 22" 28 items
- 24" 8 items
- 26" 4 items
Barrel Profile
Caliber
- .22 ARC 5 items
- .22 Cal 2 items
- .22 LR 4 items
- .223/5.56 22 items
- .223 Rem 1 item
- .223 Wylde 48 items
- .30-30 1 item
- .30 Cal 13 items
- .308 16 items
- .308 Win 44 items
- .338 1 item
- .357 Magnum 2 items
- .38/.357 Magnum 1 item
- .44/.45 2 items
- .45-70 GOVT 2 items
- .45 ACP 5 items
- .458 Socom 3 items
- 12 Gauge 1 item
- 300 Blackout 57 items
- 300 Norma Mag 1 item
- 338 Lapua 2 items
- 5.56X45 9 items
- 5.56 NATO 180 items
- 5.56mm 11 items
- 6mm ARC 23 items
- 6.5 Creedmoor 35 items
- 6.5 Grendel 17 items
- 6.5 PRC 2 items
- 6.8 SPC 2 items
- 6MM Creedmoor 17 items
- 7.62mm 7 items
- 7.62x39 12 items
- 7.62x51 11 items
- 8.6 Blackout 10 items
- 9mm 89 items
Category
- Receiver Parts 369 items
- Parts & Kits 302 items
- Barrels 333 items
- Rifle Barrels 52 items
- Buffer Systems 79 items
- Trigger Parts 177 items
- Gas Systems 72 items
- Muzzle Devices 258 items
- Bolt Parts 107 items
- Grips 190 items
- Charging Handles 92 items
- Rifle Handguards 213 items
- Stocks & Braces 196 items
- MILSPEC Parts 47 items
Configuration
- 90 Degree 1 item
- AR-10 4 items
- AR-15 29 items
- Carbine 1 item
- Clamp on Piston Block 1 item
- Cross 1 item
- Curved 25 items
- Flaming Pig 1 item
- Flat 27 items
- Gen 1-3 1 item
- Gen 3 2 items
- GEN 2 1 item
- Ghetto Blaster 1 item
- Left 1 item
- Left Hand 1 item
- M-LOK 12 items
- M4 Curve 1 item
- Mil-Spec 1 item
- Normal CQR 2 items
- Restricted CQR 2 items
- Rifle 3 items
- Right Hand 1 item
- Solid Piston Block 1 item
- Straight 8 items
- .625 DIA 9 items
- .750 DIA 30 items
- .800 DIA 2 items
- .875 DIA 4 items
- .936 DIA 6 items
- Standard Buffer and Spring 1 item
- Silent Captured Spring 9mm 1 item
- Enhanced Finger Placement (EFP) 1 item
- Type 1 Trunnion 1 item
- Type 2 Trunnion 1 item
- Large Latch 1 item
- Medium Latch 1 item
- Small Latch 1 item
- AK74 [WL 5.62"/143mm][HD .32"/8mm] 1 item
- AIMS-74 [WL 4.80"/122mm][HD .32"/8mm] 1 item
- AK-105 JBI Custom [WL 4.20"/107mm][HD .45"/11mm] 1 item
- AKM Large Bore [WL 5.83"/148mm][HD .31"/8mm] 1 item
- AMD65 [WL 4.67"/119mm][HD .31"/8mm] 1 item
- Arsenal Rifle Small Bore [WL 5.75"/146mm][HD .30"/8mm] 1 item
- Arsenal Rifle Large Bore [WL 5.75"/146mm][HD .30"/8mm] 1 item
- 5.45 Krinkov [WL 2.03"/52mm][HD .32"/8mm] 1 item
- 7.62 Krinkov [WL 2.22"/56mm][HD .31"/8mm] 1 item
- Bulgarian 5.45 Krinkov [WL 2.03"/52mm][HD .42"/11mm] 1 item
- Bulgarian AK74 [WL 5.62"/143mm][HD .42"/11mm] 1 item
- DRACO [WL 4.78"/121mm][HD .32"/8mm] 1 item
- Galil Ace [WL 2.15"/118mm][HD .32"/8mm] 1 item
- M85 [WL 4.41"/112mm][HD .31"/8mm] 1 item
- M92 2.218 [WL 3.90"/99mm][HD .30"/8mm] 1 item
- PSL [WL 3.90"/99mm][HD .30"/8mm] 1 item
- Valmet M76 / Galil Classic ARM [WL 4.20"/107mm][HD .45"/11mm] 1 item
- VEPR Small Bore [WL 5.62"/143mm][HD .32"/8mm] 1 item
- VEPR Big Bore [WL 5.62"/143mm][HD .32"/8mm] 1 item
- WZ89 Onyks [WL 2.15"/55mm][HD .32"/8mm] 1 item
- .478 +/- Bolt Face 1 item
Finish
- Arid 2 items
- Bead Blast 1 item
- Bead Blast Stainless Steel 1 item
- Black 26 items
- Black Nitride 4 items
- Blue 1 item
- Case Hardened 1 item
- Carbon Fiber 6 items
- Cerakote 8 items
- Chrome 1 item
- DLC 7 items
- FDE 5 items
- Gold 1 item
- Grey 1 item
- Melonite 3 items
- NiB-X 4 items
- Nickel Boron 8 items
- Nitride 116 items
- Nitromet 7 items
- Phosphate 8 items
- Polished 47 items
- Red 4 items
- Satin 88 items
- Stainless Steel 1 item
- Anodize 67 items
- Clear Hard Anodize 4 items
- PVD/CVD 1 item
- Quench Polish Quench (QPQ) 5 items
- Titanium Nitride (TiN) 2 items
Gas System Length
Inside Diameter
Manufacturer
- 21st Tec 6 items
- A3 Tactical 42 items
- Accu-Tac 2 items
- Advanced Armament Company (AAC) 4 items
- Aero Precision 65 items
- Aeroknox 8 items
- Agency Arms 1 item
- Airborne Arms 3 items
- ALG Defense 6 items
- American Trigger Company (ATC) 3 items
- Andro Corp Industries 8 items
- Angstadt Arms 17 items
- Apex Tactical Specialties 5 items
- Arisaka 6 items
- Armaspec 11 items
- Arms Republic 13 items
- Ascalon Arms 11 items
- Brügger & Thomet (B&T) 3 items
- B5 Systems 17 items
- Ballistic Advantage 46 items
- Battle Arms Development 50 items
- Blackout Defense 9 items
- Black River MFG 1 item
- Blitzkrieg Components 17 items
- BOBRO 1 item
- Bootleg 4 items
- Boss Barrels 10 items
- Bravo Company MFG (BCM) 85 items
- Brigand Arms 2 items
- Centurion Arms 20 items
- Chisel Machining 5 items
- Christensen Arms 5 items
- CMC Triggers 1 item
- Cobalt Kinetics 1 item
- Cross Machine Tool (CMT) 16 items
- Daniel Defense 23 items
- Dead Air Armament 7 items
- Dead Foot Arms LLC 11 items
- Devil Dog Concepts 1 item
- Die Free Co 1 item
- DPM Systems Technologies 4 items
- Drew Meyers Defense 8 items
- Driven Arms Co. 17 items
- Elftmann Tactical 6 items
- Emissary Development 6 items
- Ergo Grips 8 items
- F-1 Firearms 3 items
- F5 MFG 13 items
- Faxon Firearms 79 items
- Ferfrans 1 item
- Flatline Fiber Co 1 item
- Form Rifle 3 items
- Fortis MFG 61 items
- Forward Controls Design 92 items
- FosTecH 3 items
- Gear Head Works 5 items
- Geissele 42 items
- Grand Power 2 items
- Grey Birch MFG 7 items
- Grey Ghost Precision 2 items
- Griffin Armament 27 items
- Half Cocked Arms (HCA) 1 item
- HB Industries 25 items
- HERA ARMS 20 items
- Heresy Design 8 items
- Hiperfire 25 items
- HUXWRX 6 items
- Icarus Precision 2 items
- Icon Defense 6 items
- Iron City Rifle Works 1 item
- Jacob Grey 2 items
- James Madison Tactical (JMT) 3 items
- JK Armament 14 items
- JL Billet 5 items
- JMAC Customs 73 items
- JP Enterprises Inc 40 items
- KAK Industries 1 item
- Killer Innovations 1 item
- Kinetic Development Group 9 items
- Knight’s Armament Company (KAC) 16 items
- KNS Precision 14 items
- Kalashnikov USA 2 items
- Kaw Valley Precision 2 items
- Kratos Design Group 3 items
- Krebs Customs 8 items
- KynSHOT 6 items
- Lantac 24 items
- Law Tactical 2 items
- Lee Sporting 4 items
- Leitner-Wise 1 item
- Lewis Machine & Tool (LMT) 33 items
- LUTH-AR 3 items
- Mad Pig 6 items
- Mag-Pod 1 item
- Magpul Industries 78 items
- Matador Arms 1 item
- Maxim Defense 33 items
- MCM Firearms 1 item
- Mega Arms 1 item
- Midwest Industries 34 items
- Mission First Tactical 3 items
- Multitasker Tools 1 item
- NEMO Arms 8 items
- Neverwear Springs 1 item
- Next Level Armament 28 items
- NIGHT FISION 1 item
- Noveske 58 items
- Obsidian Arms 1 item
- Odin Works 2 items
- Patriot Ordnance Factory (POF) 9 items
- Precision Armament 17 items
- Precision Reflex Inc 2 items
- Primary Weapon Systems 23 items
- Q, LLC 17 items
- Quarter Circle 10 8 items
- R&D Precision 4 items
- Radian Weapons 18 items
- Raidworx 1 item
- Rainier Arms, LLC 254 items
- Rainier Industries 17 items
- Rehv Arms 2 items
- Reptilia Corp 9 items
- Rex Silentium 1 item
- Riflespeed 3 items
- Rise Armament 22 items
- RogueOps 3 items
- RS Regulate 6 items
- SB Tactical 11 items
- SCALARWORKS 1 item
- Seekins Precision 3 items
- Sharps Bros 29 items
- Shooting Innovations 2 items
- Sig Sauer 10 items
- Silencerco 14 items
- Sionics Weapon Systems 6 items
- SLR Rifleworks 7 items
- Sons of Liberty Gun Works 46 items
- Spinta Precision 6 items
- Sprinco (Tactical Springs) 7 items
- Springer Precision 1 item
- Stag Arms 2 items
- Stern Defense 11 items
- Strike Industries 37 items
- Superlative Arms 14 items
- Surefire 12 items
- Tactical Edge Arms 3 items
- Tango Down 1 item
- Taran Tactical Innovations 2 items
- Timney Triggers 33 items
- Tippmann Arms 1 item
- Torrent Suppressors 3 items
- Triggertech 13 items
- Troy Industries 7 items
- TruCalibre 9 items
- True North Concepts 9 items
- Tyrant Designs 17 items
- Underground Tactical 1 item
- Unity Tactical 1 item
- V Seven Weapon Systems 67 items
- VKTR Industries 5 items
- VLTOR 16 items
- White Label Armory 2 items
- WMD Guns 17 items
- WOOX 6 items
Model
Option
- AK-47/74 13 items
- AR-9 11 items
- AR-10 52 items
- AR-15 289 items
- FN 509 1 item
- Standard 2 items
- 4.720" 2 items
- 6.295" 2 items
- 7.870" 2 items
- 9.445" 2 items
- Bull's Eye 1 item
- Vertical Lines 1 item
- Minimal 1 item
- White - Standard Power 1 item
- Blue - Enhanced Power 1 item
- Red - Extra Power 1 item
- Orange - Extra Extra Power 1 item
- Yellow - Reduced Power 1 item
- White/Red - Intermediate Power 1 item
- Green - Rifle Length Standard Power 1 item
- SRS-C 3.3 oz. 1 item
- SRS-H 3.8 oz. 1 item
- SRS-H2 4.7 oz. 1 item
- SRS-H3 5.6 oz. 1 item
- SRS-BB 5.7 oz. 1 item
- SRS-9mm 6.4 oz. 1 item
- SRS-AR10 5.7 oz. 1 item
- Long 1 item
- Front 1 item
- Mid 1 item
- Rear 1 item
- Remington 700 Short Action 3 items
- Remington 700 Short Action BDL 2 items
- Remington 700 Long Action BDL 1 item
- Sauer 100 1 item
- WA 2 items
- KS 2 items
- JP Silent Captured Spring - Standard 1 item
- JP Silent Captured Spring - Heavy 1 item
- JP Silent Captured Spring - 9mm 1 item
- Buffer & Spring - Standard 3 items
- Buffer & Spring - 9mm 2 items
- Buffer & Spring - H1 3 items
- Buffer & Spring - H2 2 items
- Buffer & Spring - H3 2 items
- Heavy 1 item
- 1.125-28 TPI 3 Lug/Booster Adaptor 1 item
- 1.180-24 TPI 3 Lug/Booster Adaptor 1 item
- 9mm 2 items
- CZ 29 items
- FNH 2 items
- Glock 3 items
- Heckler & Koch 2 items
- Remington 1 item
- Sharps Bros 1 item
- Sig Sauer 2 items
- Springfield 1 item
- Holed 1 item
- Profile 1 item
- Small Lever 3 items
- Large Lever 3 items
- AKM 1 item
- Green Laser 2 items
- Adjustable 14 items
- Non-Adjustable 35 items
- MCS 2 items
- Full Size 2 items
- IWI Uzi Pro 1 item
- B&T APC 1 item
- Dimpled 4 items
- Serrated 5 items
Platform
- 10-22 1 item
- AR-9 5 items
- AR-10/LR308 68 items
- AR-15 373 items
- AK47/74 16 items
- CZ 27 items
- FNH 4 items
- H&K 3 items
- IWI 2 items
- Remington 4 items
- Remington 700 15 items
- Ruger 5 items
- Ruger 10/22 2 items
- Ruger Precision Rifle 12 items
- Savage Small Shank 15 items
- Sig Sauer 16 items
- Sig Cross 4 items
- Sig MPX 1 item
- Springfield 1 item
Price
Product Type
- 80% Lower 2 items
- 10/22 Barrel 3 items
- 10/22 Receiver 1 item
- Accessory 6 items
- Adapter Plate 1 item
- AK Accessories 1 item
- Angled Grip 25 items
- Anti Walk Pins 5 items
- AR-10/LR308 Barrel 52 items
- AR-10 / LR 308 Charging Handle 8 items
- AR-10 Complete Lower Receiver 1 item
- AR-10 Complete Upper Receiver 2 items
- AR-10 Partial Upper Receiver 3 items
- AR-10 Handguard 8 items
- AR-10 Receiver Set 6 items
- AR-10 Stripped Lower Receiver 5 items
- AR-10 Stripped Upper Receiver 4 items
- AR-15 Assembled Upper Receiver 7 items
- AR-15 Barrel 225 items
- AR-15 Charging Handle 42 items
- AR-15 Complete Lower Receiver 34 items
- AR-15 Complete Upper Receiver 59 items
- AR-15 Partial Upper Receiver 49 items
- AR-15 Handguard 83 items
- AR-15 Receiver Set 23 items
- AR-15 Rifle 1 item
- AR-15 Stripped Lower Receiver 56 items
- AR-15 Stripped Upper Receiver 41 items
- AR-15 Upper Receiver Group 1 item
- AR-9 Lower Receiver 4 items
- AR-9 Complete Lower Receiver 2 items
- AR-9 Partial Upper Receiver 1 item
- AR-9 Receiver Set 4 items
- AR-9 Upper Receiver 10 items
- Barrel 45 items
- Barrel Adapter 2 items
- Barrel Nut 4 items
- Blast Shield 5 items
- Bolt 15 items
- Bolt-Action Barrel 52 items
- Bolt-Action Receiver 1 item
- Bolt Carrier Group 70 items
- Bolt Catch 25 items
- Brace 29 items
- Brace Strap 1 item
- Buffer 35 items
- Buffer Kit 16 items
- Buffer Spring 13 items
- Buffer Tube 20 items
- Builders Kit 1 item
- Cam Pin 7 items
- Castle Nut 5 items
- Castle Nut / End Plate 8 items
- Cable Clip 1 item
- Charging Handle 44 items
- Chassis 28 items
- Cheek Riser 4 items
- Compensator 54 items
- Complete Upper 17 items
- Crush Washer 3 items
- Dust Cover 15 items
- End Cap 9 items
- End Plate 15 items
- Failure Resistant Extractor 2 items
- Finger Stop 2 items
- Firing Pin 6 items
- Flash Hider 66 items
- Forearm Accesory 20 items
- Forward Assist 12 items
- Forward Assist Spring 1 item
- Front Sight 2 items
- Gas Block 54 items
- Gas Rings 3 items
- Gas Tube 6 items
- Grip Accessory 11 items
- Grip Module 2 items
- Grip Screw 1 item
- Gunsmithing Tool 1 item
- Handguard 75 items
- Handguard Adaptor 2 items
- Handgun 1 item
- Handstop 47 items
- Iron Sight 2 items
- Key Screw 1 item
- Lower Parts Kit 25 items
- Lower Receiver 5 items
- Magazine 1 item
- Magazine Button 2 items
- Magazine Catch 11 items
- Magazine Release 23 items
- Magazine Spring 1 item
- Magwell 7 items
- Muzzle Brake 109 items
- Muzzle Device Accessory 21 items
- Partial Upper Receiver 1 item
- Parts Kit 17 items
- Patch 1 item
- Pistol Grip 69 items
- Pistol Part 1 item
- Piston 1 item
- Piston System 8 items
- Port Door 5 items
- Port Door Rod 6 items
- Port Door Spring 1 item
- Rail Adapter 10 items
- Rail Cover 2 items
- Rail Panel 17 items
- Rail Section 3 items
- Recoil Spring 2 items
- Retainer Pin 5 items
- Roll Pin 2 items
- Safety Selector 53 items
- Scope Mount 1 item
- Shim Set 5 items
- Sig MPX Barrel 1 item
- Sight Post 14 items
- Silent Captured Spring 2 items
- Sling Mount 2 items
- Spring 9 items
- Stock 105 items
- Stock Accessory 22 items
- Stock Adapter 30 items
- Suppressor 1 item
- Suppressor Accessory 1 item
- Take Down / Pivot Pins 24 items
- Trigger 146 items
- Trigger / Hammer Pins 4 items
- Trigger Guard 18 items
- Trigger Spring 1 item
- Upper Parts Kit 3 items
- Vertical Grip 33 items
- Weight 1 item
Rail Length
- 3" 1 item
- 3.25" 1 item
- 4" 2 items
- 4.25" 4 items
- 4.5" 2 items
- 4.9" 1 item
- 5" 2 items
- 5.5" 2 items
- 5.99" 1 item
- 6.0" 7 items
- 6.25" 3 items
- 6.375" 1 item
- 6.5" 2 items
- 6.7" 8 items
- 6.75" 3 items
- 6.91" 1 item
- 7" 22 items
- 7.25" 3 items
- 7.3" 1 item
- 7.5" 2 items
- 7.8" 1 item
- 7.9" 2 items
- 8" 6 items
- 8.25" 1 item
- 8.5" 2 items
- 8.6" 1 item
- 9" 13 items
- 9.1" 1 item
- 9.2" 2 items
- 9.25" 2 items
- 9.3" 2 items
- 9.5" 23 items
- 9.55" 7 items
- 9.59" 1 item
- 9.6" 7 items
- 9.75" 2 items
- 10" 30 items
- 10.25" 1 item
- 10.3" 1 item
- 10.5" 16 items
- 10.64" 2 items
- 10.7" 4 items
- 10.75" 2 items
- 10.8" 1 item
- 11" 6 items
- 11.25" 1 item
- 11.5" 11 items
- 11.7" 4 items
- 11.75" 2 items
- 11.8" 4 items
- 12" 31 items
- 12.25" 1 item
- 12.3" 1 item
- 12.4" 3 items
- 12.43" 1 item
- 12.5" 13 items
- 12.55" 1 item
- 12.6" 3 items
- 12.625" 1 item
- 12.75" 1 item
- 12.8" 1 item
- 13" 18 items
- 13.25" 2 items
- 13.5" 14 items
- 13.6" 4 items
- 13.625" 2 items
- 13.7" 9 items
- 13.75" 1 item
- 13.8" 7 items
- 14" 10 items
- 14.3" 1 item
- 15" 65 items
- 15.25" 1 item
- 15.3" 7 items
- 15.5" 1 item
- 15.8" 1 item
- 16" 1 item
- 16.3" 1 item
- 16.5" 5 items
- 17" 3 items
- 18" 2 items
Size
Thread Pitch
Twist Rate
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