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" 9 items
- 6" 8 items
- 6.5" 2 items
- 6.75" 1 item
- 7" 3 items
- 7.25" 1 item
- 7.5" 9 items
- 7.75" 2 items
- 8" 9 items
- 8.3" 1 item
- 8.5" 8 items
- 8.75" 1 item
- 9" 1 item
- 9.5" 1 item
- 9.75" 1 item
- 10" 3 items
- 10.3" 16 items
- 10.5" 34 items
- 10.7" 4 items
- 11.5" 9 items
- 11.85" 2 items
- 12" 4 items
- 12.3" 1 item
- 12.5" 14 items
- 13" 3 items
- 13.5" 1 item
- 13.7" 5 items
- 13.9" 5 items
- 14.5" 23 items
- 16" 85 items
- 16.1" 4 items
- 16.3" 1 item
- 17" 1 item
- 18" 59 items
- 20" 22 items
- 20.5" 1 item
- 22" 17 items
- 24" 7 items
- 26" 4 items
Caliber
- .22 ARC 3 items
- .22 Cal 2 items
- .22 LR 4 items
- .223/5.56 17 items
- .223 Rem 1 item
- .223 Wylde 36 items
- .30 Cal 9 items
- .308 9 items
- .308 Win 35 items
- .357 Magnum 2 items
- .44/.45 2 items
- .45-70 GOVT 2 items
- .45 ACP 4 items
- .458 Socom 2 items
- 12 Gauge 1 item
- 300 Blackout 35 items
- 300 Norma Mag 1 item
- 338 Lapua 2 items
- 5.56X45 4 items
- 5.56 NATO 110 items
- 5.56mm 9 items
- 6mm ARC 14 items
- 6.5 Creedmoor 30 items
- 6.5 Grendel 14 items
- 6.5 PRC 2 items
- 6.8 SPC 2 items
- 6MM Creedmoor 10 items
- 7.62mm 3 items
- 7.62x39 9 items
- 7.62x51 8 items
- 8.6 Blackout 4 items
- 9mm 62 items
Category
- Receiver Parts 191 items
- Parts & Kits 211 items
- Barrels 255 items
- Rifle Barrels 32 items
- Buffer Systems 49 items
- Trigger Parts 126 items
- Gas Systems 47 items
- Muzzle Devices 182 items
- Bolt Parts 56 items
- Grips 147 items
- Charging Handles 59 items
- Rifle Handguards 128 items
- Stocks & Braces 143 items
- MILSPEC Parts 42 items
Configuration
- 90 Degree 1 item
- AR-10 2 items
- AR-15 18 items
- Carbine 1 item
- Clamp on Piston Block 1 item
- Cross 1 item
- Curved 17 items
- Flaming Pig 1 item
- Flat 20 items
- Gen 1-3 1 item
- Gen 3 2 items
- GEN 2 1 item
- Ghetto Blaster 1 item
- M-LOK 9 items
- M4 Curve 1 item
- Mil-Spec 1 item
- Normal CQR 2 items
- Restricted CQR 2 items
- Rifle 2 items
- Right Hand 1 item
- Solid Piston Block 1 item
- Straight 7 items
- .625 DIA 7 items
- .750 DIA 13 items
- .800 DIA 2 items
- .875 DIA 4 items
- .936 DIA 5 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 1 item
- Bead Blast 1 item
- Bead Blast Stainless Steel 1 item
- Black 21 items
- Blue 1 item
- Case Hardened 1 item
- Carbon Fiber 6 items
- Cerakote 2 items
- DLC 3 items
- FDE 4 items
- Gold 1 item
- Grey 1 item
- Melonite 2 items
- NiB-X 3 items
- Nickel Boron 5 items
- Nitride 89 items
- Nitromet 6 items
- Phosphate 6 items
- Polished 39 items
- Red 4 items
- Satin 70 items
- Anodize 40 items
- Clear Hard Anodize 4 items
- PVD/CVD 1 item
- Quench Polish Quench (QPQ) 1 item
Gas System Length
Inside Diameter
Manufacturer
- 21st Tec 6 items
- A3 Tactical 32 items
- Accu-Tac 1 item
- Advanced Armament Company (AAC) 3 items
- Aero Precision 12 items
- Airborne Arms 3 items
- ALG Defense 5 items
- American Trigger Company (ATC) 3 items
- Andro Corp Industries 8 items
- Angstadt Arms 7 items
- Apex Tactical Specialties 4 items
- Arisaka 4 items
- Armaspec 2 items
- Arms Republic 8 items
- Ascalon Arms 7 items
- Brügger & Thomet (B&T) 1 item
- B5 Systems 14 items
- Ballistic Advantage 18 items
- Battle Arms Development 10 items
- Blackout Defense 1 item
- Black River MFG 1 item
- Blitzkrieg Components 12 items
- BOBRO 1 item
- Bootleg 2 items
- Boss Barrels 10 items
- Bravo Company MFG (BCM) 50 items
- Brigand Arms 2 items
- Centurion Arms 11 items
- Chisel Machining 4 items
- Christensen Arms 5 items
- CMC Triggers 1 item
- Cobalt Kinetics 1 item
- Cross Machine Tool (CMT) 8 items
- Daniel Defense 15 items
- Dead Air Armament 5 items
- Dead Foot Arms LLC 8 items
- Devil Dog Concepts 1 item
- Die Free Co 1 item
- DPM Systems Technologies 3 items
- Drew Meyers Defense 7 items
- Driven Arms Co. 17 items
- Elftmann Tactical 5 items
- Emissary Development 4 items
- Ergo Grips 1 item
- F-1 Firearms 3 items
- F5 MFG 4 items
- Faxon Firearms 39 items
- Form Rifle 3 items
- Fortis MFG 50 items
- Forward Controls Design 81 items
- FosTecH 1 item
- Gear Head Works 1 item
- Geissele 21 items
- Grand Power 2 items
- Grey Birch MFG 7 items
- Grey Ghost Precision 1 item
- Griffin Armament 17 items
- Half Cocked Arms (HCA) 1 item
- HB Industries 17 items
- HERA ARMS 16 items
- Heresy Design 7 items
- Hiperfire 11 items
- HUXWRX 1 item
- Icarus Precision 2 items
- Icon Defense 4 items
- Iron City Rifle Works 1 item
- Jacob Grey 2 items
- James Madison Tactical (JMT) 2 items
- JK Armament 14 items
- JL Billet 5 items
- JMAC Customs 63 items
- JP Enterprises Inc 27 items
- KAK Industries 1 item
- Killer Innovations 1 item
- Kinetic Development Group 4 items
- Knight’s Armament Company (KAC) 3 items
- KNS Precision 10 items
- Kaw Valley Precision 2 items
- Kratos Design Group 3 items
- Krebs Customs 5 items
- KynSHOT 5 items
- Lantac 10 items
- Law Tactical 2 items
- Lewis Machine & Tool (LMT) 20 items
- LUTH-AR 2 items
- Mad Pig 5 items
- Magpul Industries 69 items
- Matador Arms 1 item
- Maxim Defense 25 items
- MCM Firearms 1 item
- Mega Arms 1 item
- Midwest Industries 15 items
- Mission First Tactical 3 items
- Multitasker Tools 1 item
- NEMO Arms 4 items
- Neverwear Springs 1 item
- Next Level Armament 21 items
- NIGHT FISION 1 item
- Noveske 36 items
- Odin Works 1 item
- Patriot Ordnance Factory (POF) 9 items
- Precision Armament 11 items
- Primary Weapon Systems 17 items
- Q, LLC 12 items
- Quarter Circle 10 8 items
- R&D Precision 4 items
- Radian Weapons 13 items
- Rainier Arms, LLC 200 items
- Rainier Industries 14 items
- Rehv Arms 2 items
- Reptilia Corp 7 items
- Rex Silentium 1 item
- Riflespeed 3 items
- Rise Armament 22 items
- RogueOps 3 items
- RS Regulate 5 items
- SB Tactical 6 items
- SCALARWORKS 1 item
- Seekins Precision 3 items
- Sharps Bros 21 items
- Shooting Innovations 2 items
- Sig Sauer 4 items
- Silencerco 6 items
- Sionics Weapon Systems 1 item
- SLR Rifleworks 3 items
- Sons of Liberty Gun Works 35 items
- Spinta Precision 4 items
- Sprinco (Tactical Springs) 6 items
- Stag Arms 2 items
- Stern Defense 8 items
- Strike Industries 32 items
- Superlative Arms 13 items
- Surefire 1 item
- Tactical Edge Arms 3 items
- Tango Down 1 item
- Timney Triggers 30 items
- Tippmann Arms 1 item
- Torrent Suppressors 3 items
- Triggertech 7 items
- TruCalibre 6 items
- True North Concepts 8 items
- Tyrant Designs 12 items
- Underground Tactical 1 item
- Unity Tactical 1 item
- V Seven Weapon Systems 43 items
- VKTR Industries 5 items
- VLTOR 7 items
- White Label Armory 2 items
- WMD Guns 11 items
- WOOX 5 items
Model
Option
- AK-47/74 9 items
- AR-9 4 items
- AR-10 35 items
- AR-15 153 items
- FN 509 1 item
- Standard 1 item
- 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
- Yellow - Reduced Power 1 item
- White/Red - Intermediate Power 1 item
- Green - Rifle Length Standard Power 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 1 item
- WA 1 item
- KS 1 item
- 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 18 items
- FNH 1 item
- Remington 1 item
- Sig Sauer 2 items
- Springfield 1 item
- Small Lever 2 items
- Large Lever 1 item
- Green Laser 1 item
- Adjustable 10 items
- Non-Adjustable 21 items
- IWI Uzi Pro 1 item
- B&T APC 1 item
- Dimpled 4 items
- Serrated 5 items
Platform
- 10-22 1 item
- AR-9 4 items
- AR-10/LR308 56 items
- AR-15 253 items
- AK47/74 10 items
- CZ 21 items
- FNH 3 items
- H&K 3 items
- IWI 1 item
- Remington 2 items
- Remington 700 9 items
- Ruger 4 items
- Ruger 10/22 2 items
- Ruger Precision Rifle 12 items
- Savage Small Shank 8 items
- Sig Sauer 9 items
- Sig Cross 4 items
- Springfield 1 item
Price
Product Type
- 10/22 Barrel 3 items
- 10/22 Receiver 1 item
- Accessory 6 items
- Adapter Plate 1 item
- AK Accessories 1 item
- Angled Grip 18 items
- Anti Walk Pins 2 items
- AR-10/LR308 Barrel 43 items
- AR-10 / LR 308 Charging Handle 5 items
- AR-10 Complete Lower Receiver 1 item
- AR-10 Complete Upper Receiver 1 item
- AR-10 Partial Upper Receiver 2 items
- AR-10 Handguard 2 items
- AR-10 Receiver Set 3 items
- AR-10 Stripped Lower Receiver 3 items
- AR-10 Stripped Upper Receiver 1 item
- AR-15 Assembled Upper Receiver 5 items
- AR-15 Barrel 171 items
- AR-15 Charging Handle 25 items
- AR-15 Complete Lower Receiver 15 items
- AR-15 Complete Upper Receiver 32 items
- AR-15 Partial Upper Receiver 21 items
- AR-15 Handguard 45 items
- AR-15 Receiver Set 13 items
- AR-15 Rifle 1 item
- AR-15 Stripped Lower Receiver 27 items
- AR-15 Stripped Upper Receiver 19 items
- AR-9 Complete Lower Receiver 1 item
- AR-9 Partial Upper Receiver 1 item
- AR-9 Receiver Set 3 items
- AR-9 Upper Receiver 6 items
- Barrel 26 items
- Barrel Adapter 2 items
- Barrel Nut 4 items
- Blast Shield 3 items
- Bolt 8 items
- Bolt-Action Barrel 38 items
- Bolt-Action Receiver 1 item
- Bolt Carrier Group 31 items
- Bolt Catch 21 items
- Brace 17 items
- Buffer 23 items
- Buffer Kit 10 items
- Buffer Spring 9 items
- Buffer Tube 12 items
- Cam Pin 6 items
- Castle Nut 5 items
- Castle Nut / End Plate 7 items
- Cable Clip 1 item
- Charging Handle 34 items
- Chassis 24 items
- Cheek Riser 4 items
- Compensator 47 items
- Complete Upper 8 items
- Crush Washer 3 items
- Dust Cover 13 items
- End Cap 8 items
- End Plate 14 items
- Failure Resistant Extractor 2 items
- Finger Stop 2 items
- Firing Pin 3 items
- Flash Hider 48 items
- Forearm Accesory 15 items
- Forward Assist 6 items
- Forward Assist Spring 1 item
- Front Sight 1 item
- Gas Block 34 items
- Gas Rings 3 items
- Gas Tube 4 items
- Grip Accessory 9 items
- Grip Module 1 item
- Grip Screw 1 item
- Handguard 50 items
- Handguard Adaptor 2 items
- Handstop 36 items
- Iron Sight 1 item
- Key Screw 1 item
- Lower Parts Kit 14 items
- Lower Receiver 1 item
- Magazine 1 item
- Magazine Button 2 items
- Magazine Catch 8 items
- Magazine Release 16 items
- Magazine Spring 1 item
- Magwell 6 items
- Muzzle Brake 68 items
- Muzzle Device Accessory 13 items
- Partial Upper Receiver 1 item
- Parts Kit 16 items
- Pistol Grip 57 items
- Pistol Part 1 item
- Piston 1 item
- Piston System 7 items
- Port Door 5 items
- Port Door Rod 3 items
- Port Door Spring 1 item
- Rail Adapter 5 items
- Rail Cover 1 item
- Rail Panel 14 items
- Rail Section 1 item
- Recoil Spring 1 item
- Retainer Pin 4 items
- Roll Pin 2 items
- Safety Selector 29 items
- Shim Set 4 items
- Sight Post 12 items
- Silent Captured Spring 2 items
- Spring 7 items
- Stock 78 items
- Stock Accessory 17 items
- Stock Adapter 22 items
- Suppressor 1 item
- Suppressor Accessory 1 item
- Take Down / Pivot Pins 14 items
- Trigger 104 items
- Trigger / Hammer Pins 3 items
- Trigger Guard 16 items
- Upper Parts Kit 2 items
- Vertical Grip 23 items
Rail Length
- 3.25" 1 item
- 4" 1 item
- 4.25" 4 items
- 4.5" 2 items
- 4.9" 1 item
- 5" 1 item
- 5.5" 1 item
- 5.99" 1 item
- 6.0" 5 items
- 6.25" 2 items
- 6.375" 1 item
- 6.5" 2 items
- 6.7" 4 items
- 6.75" 3 items
- 6.91" 1 item
- 7" 13 items
- 7.25" 1 item
- 7.3" 1 item
- 7.5" 2 items
- 7.8" 1 item
- 7.9" 2 items
- 8" 4 items
- 8.5" 2 items
- 8.6" 1 item
- 9" 9 items
- 9.1" 1 item
- 9.2" 2 items
- 9.25" 1 item
- 9.3" 1 item
- 9.5" 17 items
- 9.55" 6 items
- 9.59" 1 item
- 9.6" 4 items
- 9.75" 1 item
- 10" 22 items
- 10.3" 1 item
- 10.5" 9 items
- 10.64" 1 item
- 10.7" 3 items
- 10.75" 1 item
- 10.8" 1 item
- 11" 5 items
- 11.25" 1 item
- 11.5" 8 items
- 11.7" 3 items
- 11.75" 2 items
- 11.8" 4 items
- 12" 20 items
- 12.3" 1 item
- 12.4" 1 item
- 12.43" 1 item
- 12.5" 7 items
- 12.55" 1 item
- 12.6" 3 items
- 12.75" 1 item
- 12.8" 1 item
- 13" 8 items
- 13.25" 2 items
- 13.5" 8 items
- 13.6" 4 items
- 13.625" 1 item
- 13.7" 4 items
- 13.75" 1 item
- 13.8" 5 items
- 14" 8 items
- 14.3" 1 item
- 15" 30 items
- 15.25" 1 item
- 15.3" 5 items
- 15.5" 1 item
- 15.8" 1 item
- 16.3" 1 item
- 16.5" 4 items
- 17" 2 items
- 18" 1 item
Size
Thread Pitch
Twist Rate
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