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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Strike Industries Siegen Rail Cover in Black - 5pcsSpecial Price $9.92 Regular Price $13.95
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Cross Machine Tool (CMT) Tactical AR-15 Gen 3 UHP 15 Billet Lower ReceiverSpecial Price $135.92 Regular Price $198.00
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JL Billet ECO AR-15 Billet Lower ReceiverSpecial Price $106.92 Regular Price $142.99
Shop By
Shopping Options
Barrel Length
- 3.1" 1 item
- 3.66" 1 item
- 4" 5 items
- 4.5" 2 items
- 5" 5 items
- 5.5" 8 items
- 6" 7 items
- 6.5" 2 items
- 6.75" 1 item
- 7" 3 items
- 7.5" 9 items
- 7.75" 2 items
- 8" 10 items
- 8.3" 1 item
- 8.5" 7 items
- 8.75" 1 item
- 9" 1 item
- 10" 3 items
- 10.3" 14 items
- 10.5" 28 items
- 10.7" 4 items
- 11.5" 8 items
- 12" 6 items
- 12.3" 1 item
- 12.5" 14 items
- 13" 2 items
- 13.5" 1 item
- 13.7" 6 items
- 13.9" 4 items
- 14.5" 29 items
- 16" 78 items
- 16.1" 5 items
- 16.25" 1 item
- 16.3" 1 item
- 17" 1 item
- 18" 52 items
- 20" 21 items
- 20.5" 1 item
- 22" 16 items
- 24" 7 items
- 26" 4 items
Caliber
- .22 ARC 1 item
- .22 Cal 2 items
- .22 LR 2 items
- .223/5.56 17 items
- .223 Rem 1 item
- .223 Wylde 39 items
- .30 Cal 9 items
- .308 11 items
- .308 Win 35 items
- .357 Magnum 2 items
- .44/.45 2 items
- .45-70 GOVT 2 items
- .45 ACP 4 items
- .458 Socom 1 item
- 12 Gauge 1 item
- 300 Blackout 28 items
- 300 Norma Mag 1 item
- 338 Lapua 2 items
- 350 Legend 2 items
- 5.56X45 4 items
- 5.56 NATO 109 items
- 5.56mm 9 items
- 6mm ARC 16 items
- 6.5 Creedmoor 28 items
- 6.5 Grendel 13 items
- 6.5 PRC 2 items
- 6.8 SPC 2 items
- 6MM Creedmoor 6 items
- 7.62mm 3 items
- 7.62x39 8 items
- 7.62x51 7 items
- 8.6 Blackout 5 items
- 9mm 62 items
Category
Configuration
- 90 Degree 1 item
- AR-10 2 items
- AR-15 17 items
- Clamp on Piston Block 1 item
- Cross 1 item
- Curved 22 items
- Flaming Pig 1 item
- Flat 24 items
- Gen 3 2 items
- Ghetto Blaster 1 item
- M-LOK 7 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 5 items
- .750 DIA 4 items
- .800 DIA 2 items
- .875 DIA 3 items
- .936 DIA 3 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 Stainless Steel 1 item
- Black 18 items
- Black Nitride 1 item
- Blue 1 item
- Case Hardened 1 item
- Carbon Fiber 6 items
- Cerakote 3 items
- DLC 4 items
- FDE 4 items
- Gold 1 item
- Grey 1 item
- Melonite 1 item
- NiB-X 3 items
- Nickel Boron 4 items
- Nitride 91 items
- Nitromet 5 items
- Phosphate 5 items
- Polished 34 items
- Red 3 items
- Satin 66 items
- Anodize 50 items
- Clear Hard Anodize 3 items
- PVD/CVD 1 item
- Quench Polish Quench (QPQ) 2 items
Gas System Length
Inside Diameter
Manufacturer
- 21st Tec 6 items
- A3 Tactical 30 items
- Accu-Tac 1 item
- Advanced Armament Company (AAC) 3 items
- Aero Precision 12 items
- Agency Arms 1 item
- Airborne Arms 4 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 7 items
- Armaspec 2 items
- Arms Republic 8 items
- Ascalon Arms 6 items
- Brügger & Thomet (B&T) 1 item
- B5 Systems 18 items
- Ballistic Advantage 17 items
- Battle Arms Development 11 items
- Blackout Defense 1 item
- Black River MFG 1 item
- Blitzkrieg Components 14 items
- BOBRO 1 item
- Bootleg 2 items
- Boss Barrels 10 items
- Bravo Company MFG (BCM) 51 items
- Brigand Arms 2 items
- Centurion Arms 19 items
- Chisel Machining 2 items
- Christensen Arms 5 items
- CMC Triggers 1 item
- Cobalt Kinetics 1 item
- Cross Machine Tool (CMT) 8 items
- Daniel Defense 18 items
- Dead Air Armament 6 items
- Dead Foot Arms LLC 7 items
- Devil Dog Concepts 1 item
- Die Free Co 2 items
- DPM Systems Technologies 5 items
- Drew Meyers Defense 6 items
- Driven Arms Co. 16 items
- Eartune 1 item
- Elftmann Tactical 3 items
- Emissary Development 7 items
- Ergo Grips 1 item
- F-1 Firearms 3 items
- F5 MFG 3 items
- Faxon Firearms 34 items
- Fightlite Industries 1 item
- Form Rifle 11 items
- Fortis MFG 50 items
- Forward Controls Design 85 items
- FosTecH 1 item
- Gear Head Works 4 items
- Geissele 32 items
- Grand Power 2 items
- Grey Birch MFG 6 items
- Grey Ghost Precision 1 item
- Griffin Armament 11 items
- Half Cocked Arms (HCA) 1 item
- HB Industries 16 items
- HERA ARMS 11 items
- Heresy Design 7 items
- Hiperfire 11 items
- HUXWRX 3 items
- Icarus Precision 2 items
- Icon Defense 5 items
- Iron City Rifle Works 1 item
- Jacob Grey 1 item
- James Madison Tactical (JMT) 2 items
- JK Armament 11 items
- JL Billet 5 items
- JMAC Customs 62 items
- JP Enterprises Inc 38 items
- KAK Industries 1 item
- Killer Innovations 1 item
- Kinetic Development Group 3 items
- Knight’s Armament Company (KAC) 5 items
- KNS Precision 10 items
- Kaw Valley Precision 2 items
- Kratos Design Group 2 items
- Krebs Customs 4 items
- KynSHOT 3 items
- Lantac 12 items
- Lewis Machine & Tool (LMT) 20 items
- LUTH-AR 2 items
- Mad Pig 4 items
- Magpul Industries 60 items
- Matador Arms 1 item
- Maxim Defense 26 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 18 items
- NIGHT FISION 1 item
- Noveske 29 items
- Obsidian Arms 1 item
- Odin Works 1 item
- Patriot Ordnance Factory (POF) 8 items
- Precision Armament 10 items
- Precision Reflex Inc 2 items
- Primary Weapon Systems 14 items
- Q, LLC 16 items
- Quarter Circle 10 8 items
- R&D Precision 3 items
- Radian Weapons 14 items
- Rainier Arms, LLC 197 items
- Rainier Industries 16 items
- Rehv Arms 2 items
- Reptilia Corp 4 items
- Rex Silentium 1 item
- Riflespeed 3 items
- Rise Armament 20 items
- ROAM Rifles 4 items
- RogueOps 5 items
- RS Regulate 5 items
- Samson Manufacturing Corp. 2 items
- SB Tactical 8 items
- SCALARWORKS 1 item
- Seekins Precision 1 item
- Sharps Bros 23 items
- Shooting Innovations 2 items
- Sig Sauer 6 items
- Silencerco 5 items
- Sionics Weapon Systems 1 item
- SLR Rifleworks 3 items
- Sons of Liberty Gun Works 35 items
- Spinta Precision 3 items
- Sprinco (Tactical Springs) 7 items
- Stag Arms 1 item
- Stern Defense 10 items
- Strike Industries 27 items
- Superlative Arms 14 items
- Surefire 7 items
- Tactical Edge Arms 3 items
- Tango Down 1 item
- Timney Triggers 29 items
- Tippmann Arms 1 item
- Torrent Suppressors 3 items
- Triggertech 12 items
- TruCalibre 5 items
- True North Concepts 10 items
- Tyrant Designs 12 items
- Underground Tactical 1 item
- Unity Tactical 1 item
- V Seven Weapon Systems 27 items
- VLTOR 10 items
- White Label Armory 2 items
- WMD Guns 9 items
- WOOX 5 items
Model
Option
- AK-47/74 9 items
- AR-9 4 items
- AR-10 27 items
- AR-15 163 items
- 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 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
- 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 16 items
- FNH 1 item
- Heckler & Koch 1 item
- Remington 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 1 item
- Adjustable 10 items
- Non-Adjustable 17 items
- B&T APC 1 item
- Dimpled 4 items
- Serrated 5 items
Platform
- 10-22 1 item
- AR-9 5 items
- AR-10/LR308 67 items
- AR-15 286 items
- AK47/74 16 items
- CZ 17 items
- FNH 3 items
- H&K 2 items
- IWI 1 item
- Remington 2 items
- Remington 700 6 items
- Ruger 4 items
- Ruger Precision Rifle 11 items
- Savage Small Shank 5 items
- Sig Sauer 10 items
- Sig Cross 4 items
- Springfield 1 item
- Steyr Aug 4 items
Price
Product Type
- 10/22 Barrel 1 item
- 10/22 Receiver 1 item
- Accessory 5 items
- Adapter Plate 1 item
- AK Accessories 1 item
- AK Handguard 1 item
- Angled Grip 20 items
- Anti Walk Pins 1 item
- AR-10/LR308 Barrel 52 items
- AR-10 / LR 308 Charging Handle 4 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 2 items
- AR-10 Stripped Lower Receiver 2 items
- AR-10 Stripped Upper Receiver 1 item
- AR-15 Assembled Upper Receiver 4 items
- AR-15 Barrel 175 items
- AR-15 Charging Handle 26 items
- AR-15 Complete Lower Receiver 14 items
- AR-15 Complete Upper Receiver 32 items
- AR-15 Partial Upper Receiver 25 items
- AR-15 Handguard 61 items
- AR-15 Receiver Set 14 items
- AR-15 Rifle 1 item
- AR-15 Stripped Lower Receiver 31 items
- AR-15 Stripped Upper Receiver 18 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 7 items
- Barrel Adapter 2 items
- Barrel Nut 1 item
- Blast Shield 2 items
- Bolt 14 items
- Bolt-Action Barrel 31 items
- Bolt-Action Receiver 1 item
- Bolt Carrier Group 34 items
- Bolt Catch 17 items
- Brace 24 items
- Buffer 23 items
- Buffer Kit 11 items
- Buffer Spring 16 items
- Buffer Tube 12 items
- Builders Kit 1 item
- Cam Pin 7 items
- Castle Nut 5 items
- Castle Nut / End Plate 5 items
- Cable Clip 1 item
- Charging Handle 33 items
- Chassis 34 items
- Cheek Riser 4 items
- Compensator 44 items
- Complete Upper 9 items
- Crush Washer 3 items
- Dust Cover 12 items
- End Cap 7 items
- End Plate 12 items
- Failure Resistant Extractor 2 items
- Finger Stop 2 items
- Firing Pin 4 items
- Flash Hider 54 items
- Forearm Accesory 14 items
- Forward Assist 6 items
- Forward Assist Spring 1 item
- Front Sight 2 items
- Gas Block 34 items
- Gas Rings 3 items
- Gas Tube 5 items
- Grip Accessory 11 items
- Grip Module 1 item
- Grip Screw 1 item
- Handguard 46 items
- Handguard Adaptor 2 items
- Handstop 42 items
- Iron Sight 1 item
- Key Screw 1 item
- Lower Parts Kit 15 items
- Magazine 1 item
- Magazine Button 2 items
- Magazine Catch 9 items
- Magazine Release 15 items
- Magazine Spring 1 item
- Magwell 4 items
- Muzzle Brake 68 items
- Muzzle Device Accessory 11 items
- Partial Upper Receiver 1 item
- Parts Kit 12 items
- Pistol Grip 55 items
- Pistol Part 1 item
- Piston 1 item
- Piston System 6 items
- Port Door 5 items
- Port Door Rod 2 items
- Port Door Spring 1 item
- Rail Adapter 6 items
- Rail Panel 13 items
- Rail Section 1 item
- Recoil Spring 2 items
- Roll Pin 2 items
- Safety Selector 28 items
- Shim Set 2 items
- Sight Post 12 items
- Silent Captured Spring 1 item
- Sling Mount 1 item
- Spring 8 items
- Steyr Aug Barrel 4 items
- Stock 73 items
- Stock Accessory 18 items
- Stock Adapter 22 items
- Suppressor Accessory 1 item
- Take Down / Pivot Pins 18 items
- Trigger 102 items
- Trigger / Hammer Pins 2 items
- Trigger Guard 14 items
- Upper Parts Kit 2 items
- Vertical Grip 26 items
- Weight 1 item
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" 1 item
- 6.7" 5 items
- 6.75" 3 items
- 7" 12 items
- 7.2" 1 item
- 7.25" 1 item
- 7.3" 1 item
- 7.5" 2 items
- 7.8" 1 item
- 7.9" 1 item
- 8" 4 items
- 8.5" 2 items
- 8.6" 1 item
- 9" 9 items
- 9.1" 1 item
- 9.15" 2 items
- 9.2" 2 items
- 9.25" 1 item
- 9.3" 2 items
- 9.5" 16 items
- 9.55" 6 items
- 9.59" 1 item
- 9.6" 5 items
- 9.75" 1 item
- 10" 19 items
- 10.3" 1 item
- 10.5" 11 items
- 10.64" 2 items
- 10.7" 3 items
- 10.75" 1 item
- 11" 4 items
- 11.1" 1 item
- 11.25" 1 item
- 11.5" 7 items
- 11.7" 3 items
- 11.75" 2 items
- 11.8" 4 items
- 12" 21 items
- 12.3" 1 item
- 12.4" 2 items
- 12.43" 1 item
- 12.5" 12 items
- 12.55" 1 item
- 12.6" 3 items
- 12.75" 1 item
- 12.8" 1 item
- 13" 11 items
- 13.25" 2 items
- 13.5" 11 items
- 13.6" 4 items
- 13.625" 1 item
- 13.7" 4 items
- 13.75" 1 item
- 13.8" 5 items
- 14" 9 items
- 14.3" 1 item
- 15" 36 items
- 15.25" 1 item
- 15.3" 6 items
- 15.5" 2 items
- 16.3" 1 item
- 16.5" 4 items
- 17" 2 items
- 18" 1 item
Size
Thread Pitch
Twist Rate
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