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.
Dark mode is
-
Spinta Precision AR-15 9MM Barrel - 3.1" (Rainier Arms Exclusive)Special Price $57.20 Regular Price $119.99
Shop By
Now Shopping by
Shopping Options
- Is Firearms? No Remove This Item
- Price $0.00 - $999.99 Remove This Item
Barrel Length
- 3.1" 1 item
- 3.66" 1 item
- 4" 4 items
- 4.5" 3 items
- 5" 2 items
- 5.25" 1 item
- 5.5" 9 items
- 6" 7 items
- 6.5" 3 items
- 6.75" 1 item
- 7" 4 items
- 7.25" 1 item
- 7.5" 11 items
- 7.75" 1 item
- 8" 11 items
- 8.3" 4 items
- 8.5" 11 items
- 9" 5 items
- 10" 2 items
- 10.3" 5 items
- 10.5" 40 items
- 10.7" 4 items
- 11" 1 item
- 11.5" 16 items
- 12" 7 items
- 12.3" 1 item
- 12.5" 22 items
- 13.5" 1 item
- 13.7" 7 items
- 13.9" 6 items
- 14.5" 30 items
- 16" 119 items
- 16" Dissipator 1 item
- 16.1" 1 item
- 16.3" 2 items
- 17" 1 item
- 18" 72 items
- 20" 31 items
- 20.5" 1 item
- 22" 27 items
- 24" 7 items
- 26" 3 items
Barrel Profile
Caliber
- .22 ARC 4 items
- .22 Cal 2 items
- .22 LR 3 items
- .223/5.56 22 items
- .223 Rem 1 item
- .223 Wylde 25 items
- .30-30 1 item
- .30 Cal 13 items
- .308 21 items
- .308 Win 30 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 32 items
- 300 Norma Mag 1 item
- 338 Lapua 2 items
- 5.56X45 12 items
- 5.56 NATO 115 items
- 5.56mm 13 items
- 6mm ARC 11 items
- 6.5 Creedmoor 31 items
- 6.5 Grendel 12 items
- 6.5 PRC 2 items
- 6.8 SPC 3 items
- 6MM Creedmoor 17 items
- 7.62mm 7 items
- 7.62x39 6 items
- 7.62x51 8 items
- 8.6 Blackout 8 items
- 9mm 71 items
Category
- Receiver Parts 305 items
- Parts & Kits 296 items
- Barrels 116 items
- Rifle Barrels 203 items
- Buffer Systems 74 items
- Trigger Parts 173 items
- Gas Systems 72 items
- Muzzle Devices 251 items
- Bolt Parts 104 items
- Grips 182 items
- Charging Handles 93 items
- Rifle Handguards 219 items
- Stocks & Braces 183 items
- MILSPEC Parts 46 items
Configuration
- 90 Degree 1 item
- AR-10 4 items
- AR-15 31 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
- 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 10 items
- .750 DIA 31 items
- .800 DIA 2 items
- .875 DIA 5 items
- .936 DIA 6 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 4 items
- Bead Blast Stainless Steel 1 item
- Black 27 items
- Black Nitride 4 items
- Blue 1 item
- Carbon Fiber 2 items
- Cerakote 7 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 9 items
- Nitride 65 items
- Nitromet 7 items
- Phosphate 8 items
- Polished 24 items
- Red 4 items
- Satin 29 items
- Anodize 64 items
- Clear Hard Anodize 3 items
- PVD/CVD 2 items
- Quench Polish Quench (QPQ) 9 items
- Titanium Nitride (TiN) 2 items
Gas Length
Inside Diameter
Manufacturer
- 21st Tec 6 items
- A3 Tactical 42 items
- Accu-Tac 2 items
- Advanced Armament Company (AAC) 4 items
- Aero Precision 66 items
- Aeroknox 8 items
- Agency Arms 1 item
- Airborne Arms 4 items
- ALG Defense 6 items
- American Trigger Company (ATC) 3 items
- Andro Corp Industries 8 items
- Angstadt Arms 13 items
- Apex Tactical Specialties 5 items
- Arisaka 6 items
- Armaspec 11 items
- Arms Republic 13 items
- Ascalon Arms 11 items
- Brügger & Thomet (B&T) 2 items
- B5 Systems 10 items
- Ballistic Advantage 43 items
- Battle Arms Development 49 items
- Blackout Defense 8 items
- Black River MFG 1 item
- Blitzkrieg Components 17 items
- BOBRO 1 item
- Bootleg 4 items
- Boss Barrels 8 items
- Bravo Company MFG (BCM) 83 items
- Breek Arms 1 item
- Brigand Arms 2 items
- Centurion Arms 16 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 11 items
- Dead Air Armament 7 items
- Dead Foot Arms LLC 12 items
- Devil Dog Concepts 1 item
- Die Free Co 1 item
- DPM Systems Technologies 4 items
- Drew Meyers Defense 8 items
- Driven Arms Co. 14 items
- Elftmann Tactical 6 items
- Emissary Development 6 items
- Ergo Grips 8 items
- F-1 Firearms 3 items
- F5 MFG 13 items
- Faxon Firearms 68 items
- Ferfrans 1 item
- Flatline Fiber Co 1 item
- Fortis MFG 60 items
- Forward Controls Design 92 items
- FosTecH 3 items
- Gear Head Works 4 items
- Geissele 39 items
- Grand Power 2 items
- Grey Birch MFG 6 items
- Grey Ghost Precision 2 items
- Griffin Armament 27 items
- Half Cocked Arms (HCA) 1 item
- HB Industries 25 items
- HERA ARMS 20 items
- Heresy Design 6 items
- Hiperfire 25 items
- HUXWRX 6 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 15 items
- JL Billet 5 items
- JMAC Customs 73 items
- JP Enterprises Inc 39 items
- Killer Innovations 1 item
- Kinetic Development Group 9 items
- Knight’s Armament Company (KAC) 16 items
- KNS Precision 14 items
- Kalashnikov USA 2 items
- Kaw Valley Precision 2 items
- Kratos Design Group 3 items
- Krebs Customs 8 items
- KynSHOT 6 items
- Lancer Systems 1 item
- Lantac 25 items
- Law Tactical 2 items
- Lee Sporting 4 items
- Leitner-Wise 1 item
- Lewis Machine & Tool (LMT) 26 items
- LUTH-AR 3 items
- Mad Pig 6 items
- Mag-Pod 1 item
- Magpul Industries 77 items
- Matador Arms 1 item
- Maxim Defense 16 items
- Mega Arms 1 item
- Midwest Industries 32 items
- Mission First Tactical 3 items
- Multitasker Tools 1 item
- NEMO Arms 8 items
- Neverwear Springs 1 item
- Next Level Armament 27 items
- NIGHT FISION 1 item
- Noveske 49 items
- Obsidian Arms 1 item
- Odin Works 2 items
- Patriot Ordnance Factory (POF) 9 items
- Precision Armament 17 items
- Precision Reflex Inc 2 items
- Primary Weapon Systems 10 items
- Q, LLC 11 items
- Quarter Circle 10 9 items
- R&D Precision 4 items
- Radian Weapons 17 items
- Raidworx 1 item
- Rainier Arms, LLC 180 items
- Rainier Industries 16 items
- Rehv Arms 2 items
- Reptilia Corp 9 items
- Rex Silentium 1 item
- Riflespeed 3 items
- Rise Armament 19 items
- RogueOps 3 items
- RS Regulate 6 items
- Rubber City Armory 1 item
- SB Tactical 10 items
- SCALARWORKS 1 item
- Seekins Precision 3 items
- Sharps Bros 28 items
- Shooting Innovations 1 item
- Sig Sauer 6 items
- Silencerco 14 items
- Sionics Weapon Systems 6 items
- SLR Rifleworks 7 items
- Sons of Liberty Gun Works 42 items
- Spinta Precision 6 items
- Sprinco (Tactical Springs) 7 items
- Springer Precision 1 item
- Stag Arms 2 items
- Stern Defense 11 items
- Strike Industries 37 items
- Superlative Arms 14 items
- Surefire 12 items
- Tactical Edge Arms 3 items
- Tango Down 1 item
- Taran Tactical Innovations 2 items
- Timney Triggers 32 items
- Tippmann Arms 1 item
- 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 68 items
- VKTR Industries 2 items
- VLTOR 16 items
- White Label Armory 2 items
- WMD Guns 17 items
- WOOX 5 items
Model
Option
- AK-47/74 13 items
- AR-9 12 items
- AR-10 51 items
- AR-15 293 items
- FN 509 1 item
- Standard 4 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
- 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
- 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 2 items
- CZ 29 items
- FNH 2 items
- Glock 4 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 37 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
Price
Product Type
- 80% Lower 2 items
- 10/22 Receiver 1 item
- Accessory 6 items
- Adapter Plate 1 item
- AK Accessories 1 item
- Angled Grip 25 items
- Anti Walk Pins 5 items
- AR-10 Barrel 10 items
- AR-10 / LR 308 Charging Handle 8 items
- AR-10 Complete Lower Receiver 1 item
- AR-10 Complete Upper Receiver 1 item
- AR-10 Partial Upper Receiver 1 item
- AR-10 Handguard 8 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 22 items
- AR-15 Charging Handle 43 items
- AR-15 Complete Lower Receiver 30 items
- AR-15 Complete Upper Receiver 15 items
- AR-15 Partial Upper Receiver 47 items
- AR-15 Handguard 85 items
- AR-15 Receiver Set 24 items
- AR-15 Rifle 1 item
- AR-15 Stripped Lower Receiver 59 items
- AR-15 Stripped Upper Receiver 42 items
- AR-15 Upper Receiver Group 1 item
- AR-9 Lower Receiver 4 items
- AR-9 Complete Lower Receiver 2 items
- AR-9 Receiver Set 4 items
- AR-9 Upper Receiver 9 items
- Barrel 198 items
- Barrel Adapter 2 items
- Barrel Nut 4 items
- Blast Shield 5 items
- Bolt 13 items
- Bolt-Action Barrel 46 items
- Bolt-Action Receiver 1 item
- Bolt Carrier Group 69 items
- Bolt Catch 25 items
- Brace 27 items
- Brace Strap 1 item
- Buffer 34 items
- Buffer Kit 12 items
- Buffer Spring 13 items
- Buffer Tube 19 items
- Builders Kit 1 item
- Cam Pin 7 items
- Castle Nut 5 items
- Castle Nut / End Plate 8 items
- Cable Clip 1 item
- Charging Handle 45 items
- Chassis 25 items
- Cheek Riser 4 items
- Compensator 51 items
- Complete Upper 7 items
- Crush Washer 3 items
- Dust Cover 15 items
- End Cap 9 items
- End Plate 14 items
- Failure Resistant Extractor 2 items
- Finger Stop 2 items
- Firing Pin 6 items
- Flash Hider 66 items
- Forearm Accesory 21 items
- Forward Assist 12 items
- Forward Assist Spring 1 item
- Front Sight 2 items
- Gas Block 54 items
- Gas Rings 3 items
- Gas Tube 6 items
- Grip Accessory 11 items
- Grip Module 2 items
- Grip Screw 1 item
- Gunsmithing Tool 1 item
- Handguard 75 items
- Handguard Adaptor 2 items
- Handgun 1 item
- Handstop 45 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 5 items
- Muzzle Brake 108 items
- Muzzle Device Accessory 18 items
- Parts Kit 15 items
- Patch 1 item
- Pistol Grip 69 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 10 items
- Rail Cover 2 items
- Rail Panel 17 items
- Rail Section 3 items
- Recoil Spring 2 items
- Retainer Pin 5 items
- Roll Pin 2 items
- Safety Selector 53 items
- Scope Mount 1 item
- Shim Set 5 items
- Sight Post 14 items
- Silent Captured Spring 2 items
- Sling Mount 2 items
- Spring 9 items
- Stock 94 items
- Stock Accessory 22 items
- Stock Adapter 30 items
- Suppressor Accessory 1 item
- Take Down / Pivot Pins 24 items
- Trigger 143 items
- Trigger / Hammer Pins 4 items
- Trigger Guard 17 items
- Trigger Spring 1 item
- Upper Parts Kit 3 items
- Vertical Grip 31 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
- 7" 19 items
- 7.25" 3 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" 1 item
- 8.6" 1 item
- 9" 13 items
- 9.1" 1 item
- 9.2" 2 items
- 9.25" 2 items
- 9.3" 2 items
- 9.5" 19 items
- 9.55" 7 items
- 9.59" 1 item
- 9.6" 7 items
- 9.75" 1 item
- 10" 32 items
- 10.25" 1 item
- 10.3" 1 item
- 10.5" 15 items
- 10.64" 2 items
- 10.7" 4 items
- 10.75" 2 items
- 10.8" 1 item
- 11" 5 items
- 11.25" 1 item
- 11.5" 11 items
- 11.7" 4 items
- 11.75" 2 items
- 11.8" 4 items
- 12" 32 items
- 12.25" 1 item
- 12.3" 1 item
- 12.4" 3 items
- 12.43" 1 item
- 12.5" 10 items
- 12.55" 1 item
- 12.6" 3 items
- 12.625" 1 item
- 12.8" 1 item
- 13" 18 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" 60 items
- 15.3" 6 items
- 15.5" 1 item
- 15.8" 1 item
- 16" 1 item
- 16.3" 1 item
- 16.5" 5 items
- 17" 3 items
- 18" 2 items
Size
- 3" 1 item
- 35mm rings 3 items
- BACK STRAP:Large 1 item
- BACK STRAP:Medium 2 items
- Small 1 item
- Medium 5 items
- Large 5 items
- X-Large 2 items
- 6" 1 item
- 3 Slot 3 items
- 5 Slot 6 items
- 7 Slot 2 items
- 9 Slot 29 items
- 1/2" 1 item
- 5/8" 1 item
- 1.9" 2 items
- 2.1" 2 items
- 3.3" 2 items
- 4.3" 2 items
- 4.8" 2 items
- 5.8" 2 items
Thread Pitch
Twist Rate
My Wish List