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
- Price $0.00 - $999.99 Remove This Item
Barrel Length
- 3.1" 1 item
- 4" 5 items
- 4.5" 3 items
- 5" 5 items
- 5.25" 1 item
- 5.5" 7 items
- 6" 8 items
- 6.5" 2 items
- 6.75" 1 item
- 7" 3 items
- 7.25" 1 item
- 7.5" 10 items
- 7.75" 1 item
- 8" 10 items
- 8.3" 1 item
- 8.5" 7 items
- 9" 1 item
- 10" 3 items
- 10.3" 5 items
- 10.5" 31 items
- 10.7" 5 items
- 11.5" 9 items
- 12" 4 items
- 12.3" 1 item
- 12.5" 15 items
- 13.5" 1 item
- 13.7" 3 items
- 13.9" 4 items
- 14.5" 20 items
- 16" 90 items
- 16.1" 1 item
- 16.3" 1 item
- 17" 1 item
- 18" 64 items
- 20" 22 items
- 20.5" 1 item
- 22" 17 items
- 24" 8 items
- 26" 4 items
Caliber
- .22 ARC 2 items
- .22 Cal 2 items
- .22 LR 3 items
- .223/5.56 17 items
- .223 Rem 1 item
- .223 Wylde 35 items
- .30 Cal 7 items
- .308 11 items
- .308 Win 36 items
- .45 ACP 4 items
- .458 Socom 1 item
- 12 Gauge 1 item
- 300 Blackout 25 items
- 300 Norma Mag 1 item
- 338 Lapua 2 items
- 5.56X45 5 items
- 5.56 NATO 83 items
- 5.56mm 10 items
- 6mm ARC 13 items
- 6.5 Creedmoor 30 items
- 6.5 Grendel 14 items
- 6.5 PRC 2 items
- 6.8 SPC 3 items
- 6MM Creedmoor 11 items
- 7.62mm 4 items
- 7.62x39 5 items
- 7.62x51 8 items
- 8.6 Blackout 6 items
- 9mm 58 items
Category
- Receiver Parts 159 items
- Parts & Kits 230 items
- Barrels 193 items
- Rifle Barrels 80 items
- Buffer Systems 46 items
- Trigger Parts 115 items
- Gas Systems 53 items
- Muzzle Devices 181 items
- Bolt Parts 58 items
- Grips 145 items
- Charging Handles 68 items
- Rifle Handguards 145 items
- Stocks & Braces 141 items
- MILSPEC Parts 42 items
Configuration
- 90 Degree 1 item
- AR-10 3 items
- AR-15 21 items
- Clamp on Piston Block 1 item
- Curved 18 items
- Flat 18 items
- Gen 3 2 items
- Left 1 item
- M-LOK 9 items
- 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 15 items
- .800 DIA 2 items
- .875 DIA 5 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
- Bead Blast 2 items
- Bead Blast Stainless Steel 1 item
- Black 21 items
- Blue 1 item
- Case Hardened 1 item
- Carbon Fiber 2 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 4 items
- Nitride 72 items
- Nitromet 6 items
- Phosphate 6 items
- Polished 40 items
- Red 4 items
- Satin 68 items
- Anodize 41 items
- PVD/CVD 2 items
- Quench Polish Quench (QPQ) 6 items
Gas System Length
Inside Diameter
Manufacturer
- 21st Tec 6 items
- A3 Tactical 33 items
- Accu-Tac 2 items
- Advanced Armament Company (AAC) 3 items
- Aero Precision 15 items
- Airborne Arms 3 items
- ALG Defense 4 items
- American Trigger Company (ATC) 3 items
- Andro Corp Industries 8 items
- Angstadt Arms 3 items
- Apex Tactical Specialties 4 items
- Arisaka 6 items
- Armaspec 3 items
- Arms Republic 8 items
- Ascalon Arms 7 items
- Brügger & Thomet (B&T) 1 item
- B5 Systems 10 items
- Ballistic Advantage 19 items
- Battle Arms Development 14 items
- Black River MFG 1 item
- Blitzkrieg Components 15 items
- BOBRO 1 item
- Bootleg 2 items
- Boss Barrels 11 items
- Bravo Company MFG (BCM) 57 items
- Breek Arms 1 item
- 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 9 items
- Dead Air Armament 6 items
- Dead Foot Arms LLC 8 items
- Devil Dog Concepts 1 item
- Die Free Co 1 item
- DPM Systems Technologies 4 items
- Drew Meyers Defense 4 items
- Driven Arms Co. 11 items
- Elftmann Tactical 5 items
- Emissary Development 4 items
- Ergo Grips 1 item
- F-1 Firearms 3 items
- F5 MFG 1 item
- Faxon Firearms 35 items
- Ferfrans 1 item
- Flatline Fiber Co 1 item
- Fortis MFG 52 items
- Forward Controls Design 86 items
- FosTecH 1 item
- Gear Head Works 4 items
- Geissele 18 items
- Grand Power 2 items
- Grey Ghost Precision 1 item
- Griffin Armament 21 items
- Half Cocked Arms (HCA) 1 item
- HB Industries 22 items
- HERA ARMS 14 items
- Heresy Design 5 items
- Hiperfire 12 items
- HUXWRX 3 items
- Icarus Precision 2 items
- Icon Defense 5 items
- Iron City Rifle Works 1 item
- Jacob Grey 2 items
- James Madison Tactical (JMT) 2 items
- JK Armament 13 items
- JL Billet 5 items
- JMAC Customs 65 items
- JP Enterprises Inc 31 items
- Killer Innovations 1 item
- Kinetic Development Group 4 items
- Knight’s Armament Company (KAC) 2 items
- KNS Precision 13 items
- Kaw Valley Precision 2 items
- Kratos Design Group 3 items
- Krebs Customs 6 items
- KynSHOT 4 items
- Lancer Systems 1 item
- Lantac 8 items
- Law Tactical 1 item
- Leitner-Wise 1 item
- Lewis Machine & Tool (LMT) 17 items
- LUTH-AR 3 items
- Mad Pig 5 items
- Mag-Pod 1 item
- Magpul Industries 67 items
- Maxim Defense 16 items
- Mega Arms 1 item
- Midwest Industries 9 items
- Mission First Tactical 3 items
- Multitasker Tools 1 item
- NEMO Arms 4 items
- Neverwear Springs 1 item
- Next Level Armament 27 items
- NIGHT FISION 1 item
- Noveske 21 items
- Odin Works 2 items
- Patriot Ordnance Factory (POF) 6 items
- Precision Armament 12 items
- Precision Reflex Inc 2 items
- Primary Weapon Systems 3 items
- Q, LLC 7 items
- Quarter Circle 10 8 items
- R&D Precision 3 items
- Radian Weapons 14 items
- Raidworx 1 item
- Rainier Arms, LLC 202 items
- Rainier Industries 16 items
- Rehv Arms 2 items
- Reptilia Corp 9 items
- Rex Silentium 1 item
- Riflespeed 3 items
- Rise Armament 20 items
- RogueOps 3 items
- RS Regulate 6 items
- Rubber City Armory 1 item
- SB Tactical 7 items
- SCALARWORKS 1 item
- Seekins Precision 3 items
- Sharps Bros 21 items
- Shooting Innovations 2 items
- Sig Sauer 4 items
- Silencerco 5 items
- Sionics Weapon Systems 1 item
- SLR Rifleworks 3 items
- Sons of Liberty Gun Works 37 items
- Spinta Precision 5 items
- Sprinco (Tactical Springs) 7 items
- Stag Arms 2 items
- Stern Defense 8 items
- Strike Industries 36 items
- Superlative Arms 14 items
- Surefire 3 items
- Tactical Edge Arms 3 items
- Tango Down 1 item
- Taran Tactical Innovations 1 item
- Timney Triggers 30 items
- Tippmann Arms 1 item
- Triggertech 7 items
- TruCalibre 6 items
- True North Concepts 9 items
- Tyrant Designs 13 items
- Underground Tactical 1 item
- Unity Tactical 1 item
- V Seven Weapon Systems 53 items
- VKTR Industries 2 items
- VLTOR 10 items
- White Label Armory 2 items
- WMD Guns 13 items
- WOOX 4 items
Model
Option
- AK-47/74 9 items
- AR-9 4 items
- AR-10 34 items
- AR-15 183 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
- Orange - Extra 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
- Mid Length 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
- Heckler & Koch 1 item
- Sharps Bros 1 item
- Sig Sauer 2 items
- Springfield 1 item
- Holed 1 item
- Profile 1 item
- Small Lever 2 items
- Large Lever 1 item
- Green Laser 2 items
- Adjustable 11 items
- Non-Adjustable 23 items
- IWI Uzi Pro 1 item
- B&T APC 1 item
- Dimpled 4 items
- Serrated 5 items
Platform
Price
Product Type
- 10/22 Receiver 1 item
- Accessory 5 items
- Adapter Plate 1 item
- AK Accessories 1 item
- Angled Grip 21 items
- Anti Walk Pins 2 items
- AR-10/LR308 Barrel 38 items
- AR-10 / LR 308 Charging Handle 5 items
- AR-10 Complete Lower Receiver 1 item
- AR-10 Handguard 3 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 119 items
- AR-15 Charging Handle 29 items
- AR-15 Complete Lower Receiver 8 items
- AR-15 Complete Upper Receiver 8 items
- AR-15 Partial Upper Receiver 27 items
- AR-15 Handguard 57 items
- AR-15 Receiver Set 15 items
- AR-15 Rifle 1 item
- AR-15 Stripped Lower Receiver 36 items
- AR-15 Stripped Upper Receiver 22 items
- AR-15 Upper Receiver Group 1 item
- AR-9 Complete Lower Receiver 1 item
- AR-9 Receiver Set 3 items
- AR-9 Upper Receiver 4 items
- Barrel 75 items
- Barrel Adapter 2 items
- Barrel Nut 4 items
- Blast Shield 3 items
- Bolt 7 items
- Bolt-Action Barrel 36 items
- Bolt-Action Receiver 1 item
- Bolt Carrier Group 33 items
- Bolt Catch 19 items
- Brace 22 items
- Brace Strap 1 item
- Buffer 25 items
- Buffer Kit 7 items
- Buffer Spring 12 items
- Buffer Tube 9 items
- Cam Pin 6 items
- Castle Nut 5 items
- Castle Nut / End Plate 8 items
- Cable Clip 1 item
- Charging Handle 40 items
- Chassis 18 items
- Cheek Riser 4 items
- Compensator 44 items
- Complete Upper 1 item
- Crush Washer 3 items
- Dust Cover 14 items
- End Cap 8 items
- End Plate 12 items
- Failure Resistant Extractor 2 items
- Finger Stop 2 items
- Firing Pin 4 items
- Flash Hider 48 items
- Forearm Accesory 17 items
- Forward Assist 11 items
- Forward Assist Spring 1 item
- Front Sight 2 items
- Gas Block 39 items
- Gas Rings 3 items
- Gas Tube 4 items
- Grip Accessory 11 items
- Grip Module 1 item
- Grip Screw 1 item
- Handguard 48 items
- Handguard Adaptor 2 items
- Handstop 30 items
- Iron Sight 1 item
- Key Screw 1 item
- Lower Parts Kit 16 items
- Lower Receiver 1 item
- Magazine 1 item
- Magazine Button 2 items
- Magazine Catch 9 items
- Magazine Release 17 items
- Magazine Spring 1 item
- Magwell 4 items
- Muzzle Brake 70 items
- Muzzle Device Accessory 13 items
- Parts Kit 14 items
- Pistol Grip 58 items
- Pistol Part 1 item
- Piston 1 item
- Piston System 7 items
- Port Door 4 items
- Port Door Rod 5 items
- Port Door Spring 1 item
- Rail Adapter 8 items
- Rail Cover 2 items
- Rail Panel 14 items
- Rail Section 1 item
- Recoil Spring 1 item
- Retainer Pin 3 items
- Roll Pin 2 items
- Safety Selector 38 items
- Shim Set 4 items
- Sight Post 14 items
- Silent Captured Spring 1 item
- Spring 9 items
- Stock 69 items
- Stock Accessory 18 items
- Stock Adapter 24 items
- Suppressor Accessory 1 item
- Take Down / Pivot Pins 18 items
- Trigger 94 items
- Trigger / Hammer Pins 4 items
- Trigger Guard 14 items
- Upper Parts Kit 2 items
- Vertical Grip 25 items
Rail Length
- 3.25" 1 item
- 4" 1 item
- 4.25" 4 items
- 4.5" 2 items
- 4.9" 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
- 7" 16 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" 1 item
- 8.6" 1 item
- 9" 10 items
- 9.1" 1 item
- 9.2" 2 items
- 9.25" 2 items
- 9.3" 2 items
- 9.5" 15 items
- 9.55" 6 items
- 9.59" 1 item
- 9.6" 4 items
- 9.75" 1 item
- 10" 18 items
- 10.25" 1 item
- 10.3" 1 item
- 10.5" 10 items
- 10.64" 2 items
- 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" 4 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" 8 items
- 12.55" 1 item
- 12.6" 3 items
- 12.8" 1 item
- 13" 10 items
- 13.25" 2 items
- 13.5" 11 items
- 13.7" 5 items
- 13.75" 1 item
- 13.8" 5 items
- 14" 8 items
- 14.3" 1 item
- 15" 37 items
- 15.3" 4 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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