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" 14 items
- 8.3" 4 items
- 8.5" 13 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" 41 items
- 10.7" 5 items
- 11" 1 item
- 11.5" 19 items
- 11.85" 2 items
- 12" 11 items
- 12.3" 1 item
- 12.5" 21 items
- 13" 3 items
- 13.5" 1 item
- 13.7" 10 items
- 13.9" 6 items
- 14.5" 37 items
- 16" 124 items
- 16.1" 7 items
- 16.3" 2 items
- 17" 1 item
- 18" 80 items
- 20" 34 items
- 20.5" 1 item
- 22" 30 items
- 24" 8 items
- 26" 4 items
Barrel Profile
Caliber
- .22 ARC 5 items
- .22 Cal 2 items
- .22 LR 3 items
- .223/5.56 23 items
- .223 Rem 1 item
- .223 Wylde 57 items
- .30-30 1 item
- .30 Cal 13 items
- .308 16 items
- .308 Win 49 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
- 350 Legend 2 items
- 5.56X45 9 items
- 5.56 NATO 185 items
- 5.56mm 11 items
- 6mm ARC 25 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 10 items
- 8.6 Blackout 12 items
- 9mm 88 items
Category
Configuration
- 90 Degree 1 item
- AR-10 4 items
- AR-15 28 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 8 items
- .750 DIA 9 items
- .800 DIA 2 items
- .875 DIA 3 items
- .936 DIA 4 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 Stainless Steel 1 item
- Black 25 items
- Black Nitride 3 items
- Blue 1 item
- Case Hardened 1 item
- Carbon Fiber 6 items
- Cerakote 10 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 133 items
- Nitromet 7 items
- Phosphate 8 items
- Polished 47 items
- Red 4 items
- Satin 93 items
- Anodize 69 items
- Clear Hard Anodize 4 items
- PVD/CVD 1 item
- Quench Polish Quench (QPQ) 6 items
- Titanium Nitride (TiN) 2 items
Gas System Length
Inside Diameter
Manufacturer
- 21st Tec 6 items
- A3 Tactical 41 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 16 items
- Apex Tactical Specialties 5 items
- Arisaka 7 items
- Armaspec 11 items
- Arms Republic 11 items
- Ascalon Arms 11 items
- Brügger & Thomet (B&T) 4 items
- B5 Systems 22 items
- Ballistic Advantage 46 items
- Battle Arms Development 49 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 22 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 2 items
- DPM Systems Technologies 5 items
- Drew Meyers Defense 8 items
- Driven Arms Co. 17 items
- Eartune 1 item
- Elftmann Tactical 6 items
- Emissary Development 6 items
- Ergo Grips 8 items
- F-1 Firearms 3 items
- F5 MFG 13 items
- Faxon Firearms 74 items
- Ferfrans 1 item
- Flatline Fiber Co 1 item
- Form Rifle 2 items
- Fortis MFG 61 items
- Forward Controls Design 93 items
- FosTecH 1 item
- Gear Head Works 7 items
- Geissele 44 items
- Grand Power 2 items
- Grey Birch MFG 7 items
- Grey Ghost Precision 1 item
- Griffin Armament 27 items
- Half Cocked Arms (HCA) 1 item
- HB Industries 25 items
- HERA ARMS 19 items
- Heresy Design 8 items
- Hiperfire 25 items
- HUXWRX 8 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 74 items
- JP Enterprises Inc 49 items
- KAK Industries 1 item
- Killer Innovations 1 item
- Kinetic Development Group 9 items
- Knight’s Armament Company (KAC) 18 items
- KNS Precision 15 items
- Kalashnikov USA 2 items
- Kaw Valley Precision 2 items
- Kratos Design Group 3 items
- Krebs Customs 8 items
- KynSHOT 6 items
- Lantac 25 items
- Law Tactical 2 items
- Lee Sporting 4 items
- Leitner-Wise 1 item
- Lewis Machine & Tool (LMT) 33 items
- LUTH-AR 2 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 35 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 59 items
- Obsidian Arms 1 item
- Odin Works 1 item
- Patriot Ordnance Factory (POF) 9 items
- Precision Armament 17 items
- Precision Reflex Inc 2 items
- Primary Weapon Systems 23 items
- Q, LLC 19 items
- Quarter Circle 10 8 items
- R&D Precision 4 items
- Radian Weapons 21 items
- Raidworx 1 item
- Rainier Arms, LLC 264 items
- Rainier Industries 17 items
- Rehv Arms 2 items
- Reptilia Corp 9 items
- Rex Silentium 1 item
- Riflespeed 3 items
- Rise Armament 24 items
- ROAM Rifles 4 items
- RogueOps 3 items
- RS Regulate 6 items
- Samson Manufacturing Corp. 2 items
- SB Tactical 12 items
- SCALARWORKS 1 item
- Seekins Precision 1 item
- Sharps Bros 29 items
- Shooting Innovations 2 items
- Sig Sauer 13 items
- Silencerco 14 items
- Sionics Weapon Systems 6 items
- SLR Rifleworks 7 items
- Sons of Liberty Gun Works 47 items
- Spinta Precision 6 items
- Sprinco (Tactical Springs) 7 items
- Springer Precision 1 item
- Stag Arms 2 items
- Stern Defense 11 items
- Strike Industries 30 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 51 items
- AR-15 287 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
- H2 Buffer 2 items
- 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 1 item
- 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 31 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 84 items
- AR-15 425 items
- AK47/74 19 items
- CZ 27 items
- FNH 5 items
- H&K 4 items
- IWI 2 items
- Remington 4 items
- Remington 700 15 items
- Ruger 5 items
- Ruger 10/22 1 item
- Ruger Precision Rifle 12 items
- Savage Small Shank 15 items
- Sig Sauer 18 items
- Sig Cross 4 items
- Sig MPX 1 item
- Springfield 1 item
- Steyr Aug 5 items
Price
Product Type
- 80% Lower 2 items
- 10/22 Barrel 2 items
- 10/22 Receiver 1 item
- Accessory 6 items
- Adapter Plate 2 items
- AK Accessories 1 item
- Angled Grip 23 items
- Anti Walk Pins 5 items
- AR-10/LR308 Barrel 67 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 7 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 259 items
- AR-15 Charging Handle 44 items
- AR-15 Complete Lower Receiver 35 items
- AR-15 Complete Upper Receiver 57 items
- AR-15 Partial Upper Receiver 49 items
- AR-15 Handguard 89 items
- AR-15 Receiver Set 23 items
- AR-15 Rifle 1 item
- AR-15 Stripped Lower Receiver 58 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 Adapter 2 items
- Barrel Nut 4 items
- Blast Shield 5 items
- Bolt 18 items
- Bolt-Action Barrel 52 items
- Bolt-Action Receiver 1 item
- Bolt Carrier Group 71 items
- Bolt Catch 25 items
- Brace 32 items
- Brace Strap 1 item
- Buffer 35 items
- Buffer Kit 17 items
- Buffer Spring 19 items
- Buffer Tube 20 items
- Builders Kit 2 items
- Cam Pin 7 items
- Castle Nut 5 items
- Castle Nut / End Plate 7 items
- Cable Clip 1 item
- Charging Handle 45 items
- Chassis 28 items
- Cheek Riser 4 items
- Compensator 55 items
- Complete Upper 18 items
- Crush Washer 3 items
- Dust Cover 16 items
- End Cap 9 items
- End Plate 16 items
- Failure Resistant Extractor 2 items
- Finger Stop 2 items
- Firing Pin 6 items
- Flash Hider 67 items
- Forearm Accesory 20 items
- Forward Assist 10 items
- Forward Assist Spring 1 item
- Front Sight 2 items
- Gas Block 55 items
- Gas Rings 3 items
- Gas Tube 6 items
- Grip Accessory 12 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 111 items
- Muzzle Device Accessory 23 items
- Partial Upper Receiver 1 item
- Parts Kit 13 items
- Patch 1 item
- Pistol Grip 70 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 11 items
- Rail Cover 2 items
- Rail Panel 16 items
- Rail Section 3 items
- Recoil Spring 3 items
- Retainer Pin 5 items
- Roll Pin 2 items
- Safety Selector 54 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
- Steyr Aug Barrel 5 items
- Stock 105 items
- Stock Accessory 23 items
- Stock Adapter 31 items
- Suppressor 1 item
- Suppressor Accessory 1 item
- Take Down / Pivot Pins 25 items
- Trigger 144 items
- Trigger / Hammer Pins 4 items
- Trigger Guard 17 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" 19 items
- 7.2" 2 items
- 7.25" 2 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" 11 items
- 9.1" 1 item
- 9.15" 2 items
- 9.2" 2 items
- 9.25" 1 item
- 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" 5 items
- 11.1" 2 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" 15 items
- 12.55" 1 item
- 12.6" 3 items
- 12.625" 1 item
- 12.75" 1 item
- 12.8" 1 item
- 13" 17 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" 64 items
- 15.25" 1 item
- 15.3" 7 items
- 15.5" 2 items
- 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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