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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Barrel Length
Caliber
- .223/5.56 6 items
- .223 Wylde 3 items
- .30 Cal 3 items
- .308 6 items
- .308 Win 2 items
- .38/.357 Magnum 1 item
- .45 ACP 3 items
- 12 Gauge 1 item
- 300 Blackout 17 items
- 5.56 NATO 55 items
- 5.56mm 2 items
- 6.5 Grendel 1 item
- 6.8 SPC 1 item
- 7.62mm 5 items
- 7.62x39 4 items
- 7.62x51 2 items
- 8.6 Blackout 1 item
- 9mm 17 items
Category
Configuration
- AR-10 1 item
- AR-15 6 items
- Carbine 1 item
- Curved 11 items
- Flat 8 items
- Gen 3 1 item
- M-LOK 2 items
- Normal CQR 2 items
- Restricted CQR 2 items
- Straight 4 items
- Enhanced Finger Placement (EFP) 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
Finish
Gas System Length
Inside Diameter
Manufacturer
- A3 Tactical 7 items
- Aero Precision 28 items
- Aeroknox 1 item
- Airborne Arms 3 items
- ALG Defense 2 items
- Andro Corp Industries 1 item
- Angstadt Arms 5 items
- Arisaka 1 item
- Arms Republic 2 items
- Brügger & Thomet (B&T) 1 item
- B5 Systems 5 items
- Ballistic Advantage 19 items
- Battle Arms Development 6 items
- Blitzkrieg Components 2 items
- BOBRO 1 item
- Bootleg 2 items
- Bravo Company MFG (BCM) 5 items
- Brigand Arms 1 item
- Centurion Arms 5 items
- Chisel Machining 2 items
- CMC Triggers 1 item
- Cross Machine Tool (CMT) 8 items
- Dead Air Armament 1 item
- Dead Foot Arms LLC 1 item
- Devil Dog Concepts 1 item
- DPM Systems Technologies 2 items
- F-1 Firearms 1 item
- F5 MFG 2 items
- Faxon Firearms 34 items
- Ferfrans 1 item
- Fortis MFG 12 items
- Forward Controls Design 10 items
- Gear Head Works 5 items
- Geissele 7 items
- Grey Birch MFG 1 item
- Griffin Armament 6 items
- HB Industries 3 items
- HERA ARMS 8 items
- Hiperfire 9 items
- HUXWRX 5 items
- Icon Defense 4 items
- Iron City Rifle Works 1 item
- Jacob Grey 1 item
- JK Armament 1 item
- JL Billet 2 items
- JMAC Customs 37 items
- JP Enterprises Inc 14 items
- Killer Innovations 1 item
- Kinetic Development Group 2 items
- Knight’s Armament Company (KAC) 4 items
- KNS Precision 2 items
- Kalashnikov USA 1 item
- Krebs Customs 1 item
- KynSHOT 6 items
- Lantac 11 items
- Magpul Industries 7 items
- Maxim Defense 3 items
- Midwest Industries 20 items
- NEMO Arms 2 items
- Next Level Armament 5 items
- Noveske 5 items
- Patriot Ordnance Factory (POF) 2 items
- Precision Armament 11 items
- Primary Weapon Systems 2 items
- Q, LLC 2 items
- Quarter Circle 10 1 item
- Radian Weapons 6 items
- Raidworx 1 item
- Rainier Arms, LLC 26 items
- Rainier Industries 2 items
- Reptilia Corp 4 items
- Rex Silentium 1 item
- Riflespeed 2 items
- Rise Armament 10 items
- SB Tactical 4 items
- SCALARWORKS 1 item
- Seekins Precision 1 item
- Sharps Bros 6 items
- Sig Sauer 2 items
- Silencerco 1 item
- Sionics Weapon Systems 1 item
- SLR Rifleworks 2 items
- Sons of Liberty Gun Works 18 items
- Spinta Precision 4 items
- Stern Defense 7 items
- Strike Industries 1 item
- Superlative Arms 4 items
- Surefire 9 items
- Timney Triggers 5 items
- Torrent Suppressors 1 item
- Triggertech 6 items
- Troy Industries 1 item
- Tyrant Designs 8 items
- V Seven Weapon Systems 7 items
- VKTR Industries 1 item
- VLTOR 2 items
- WMD Guns 3 items
Option
- AK-47/74 3 items
- AR-9 4 items
- AR-10 13 items
- AR-15 81 items
- Standard 1 item
- Front 1 item
- Mid 1 item
- Rear 1 item
- WA 1 item
- KS 1 item
- Heavy 1 item
- CZ 6 items
- Glock 1 item
- Heckler & Koch 1 item
- Sharps Bros 1 item
- Sig Sauer 1 item
- Small Lever 1 item
- Large Lever 1 item
- Adjustable 5 items
- Non-Adjustable 2 items
Platform
Price
Product Type
- 10/22 Receiver 1 item
- AK Accessories 1 item
- Angled Grip 1 item
- AR-10/LR308 Barrel 1 item
- AR-10 / LR 308 Charging Handle 5 items
- AR-10 Complete Upper Receiver 1 item
- AR-10 Handguard 3 items
- AR-10 Stripped Lower Receiver 1 item
- AR-10 Stripped Upper Receiver 1 item
- AR-15 Assembled Upper Receiver 4 items
- AR-15 Barrel 68 items
- AR-15 Charging Handle 11 items
- AR-15 Handguard 29 items
- AR-15 Rifle 1 item
- AR-15 Stripped Lower Receiver 30 items
- AR-15 Stripped Upper Receiver 24 items
- AR-9 Lower Receiver 2 items
- Blast Shield 2 items
- Bolt 8 items
- Bolt Carrier Group 31 items
- Brace 12 items
- Buffer 11 items
- Buffer Kit 5 items
- Buffer Spring 8 items
- Buffer Tube 3 items
- Builders Kit 1 item
- Charging Handle 7 items
- Chassis 1 item
- Compensator 10 items
- Flash Hider 27 items
- Forearm Accesory 1 item
- Gas Block 8 items
- Handguard 29 items
- Iron Sight 1 item
- Lower Parts Kit 5 items
- Lower Receiver 1 item
- Muzzle Brake 51 items
- Muzzle Device Accessory 8 items
- Parts Kit 1 item
- Pistol Grip 11 items
- Piston 1 item
- Piston System 4 items
- Rail Adapter 4 items
- Rail Section 1 item
- Safety Selector 1 item
- Silent Captured Spring 1 item
- Stock 26 items
- Stock Accessory 6 items
- Stock Adapter 10 items
- Trigger 40 items
- Vertical Grip 2 items
Rail Length
- 3" 1 item
- 4" 2 items
- 4.25" 3 items
- 4.5" 2 items
- 5.5" 2 items
- 6.0" 3 items
- 6.25" 2 items
- 6.5" 1 item
- 6.7" 6 items
- 6.75" 3 items
- 7" 8 items
- 7.25" 1 item
- 7.5" 2 items
- 7.9" 1 item
- 8" 1 item
- 8.25" 1 item
- 8.6" 1 item
- 9" 6 items
- 9.1" 1 item
- 9.2" 1 item
- 9.5" 8 items
- 9.55" 1 item
- 9.6" 3 items
- 10" 3 items
- 10.25" 1 item
- 10.3" 1 item
- 10.5" 10 items
- 10.7" 2 items
- 11.25" 1 item
- 11.5" 4 items
- 11.7" 2 items
- 12" 6 items
- 12.3" 1 item
- 12.4" 3 items
- 12.5" 7 items
- 12.6" 1 item
- 12.625" 1 item
- 12.8" 1 item
- 13" 5 items
- 13.5" 4 items
- 13.7" 6 items
- 13.8" 3 items
- 14" 2 items
- 14.3" 1 item
- 15" 24 items
- 15.3" 3 items
- 16.3" 1 item
- 16.5" 1 item
Size
Thread Pitch
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