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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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  1. Price $100.00 - $199.99 Remove This Item
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Barrel Length
  1. 4" 1 item
  2. 6" 2 items
  3. 6.5" 1 item
  4. 6.75" 1 item
  5. 7" 1 item
  6. 7.5" 1 item
  7. 8" 3 items
  8. 8.5" 1 item
  9. 9" 1 item
  10. 10" 1 item
  11. 10.3" 1 item
  12. 10.5" 8 items
  13. 10.7" 2 items
  14. 11.5" 3 items
  15. 12.5" 2 items
  16. 13.7" 2 items
  17. 13.9" 1 item
  18. 14.5" 4 items
  19. 16" 9 items
  20. 18" 5 items
  21. 20" 1 item
Barrel Profile
  1. Lightweight 3 items
Caliber
  1. .22 LR 3 items
  2. .223/5.56 4 items
  3. .223 Wylde 1 item
  4. .30 Cal 2 items
  5. .308 4 items
  6. .308 Win 1 item
  7. .45 ACP 2 items
  8. 12 Gauge 1 item
  9. 300 Blackout 8 items
  10. 5.56 NATO 37 items
  11. 5.56mm 2 items
  12. 6.5 Creedmoor 1 item
  13. 6.8 SPC 1 item
  14. 7.62mm 3 items
  15. 7.62x39 4 items
  16. 7.62x51 2 items
  17. 9mm 9 items
Category
  1. Receiver Parts 33 items
  2. Parts & Kits 5 items
  3. Barrels 47 items
  4. Buffer Systems 20 items
  5. Trigger Parts 28 items
  6. Gas Systems 10 items
  7. Muzzle Devices 70 items
  8. Bolt Parts 25 items
  9. Grips 12 items
  10. Charging Handles 14 items
  11. Rifle Handguards 29 items
  12. Stocks & Braces 37 items
Color
Configuration
  1. AR-10 1 item
  2. AR-15 3 items
  3. Curved 9 items
  4. Flat 6 items
  5. Gen 3 1 item
  6. M-LOK 1 item
  7. Straight 4 items
  8. Enhanced Finger Placement (EFP) 1 item
  9. AK74 [WL 5.62"/143mm][HD .32"/8mm] 1 item
  10. AIMS-74 [WL 4.80"/122mm][HD .32"/8mm] 1 item
  11. AK-105 JBI Custom [WL 4.20"/107mm][HD .45"/11mm] 1 item
  12. AKM Large Bore [WL 5.83"/148mm][HD .31"/8mm] 1 item
  13. AMD65 [WL 4.67"/119mm][HD .31"/8mm] 1 item
  14. Arsenal Rifle Small Bore [WL 5.75"/146mm][HD .30"/8mm] 1 item
  15. Arsenal Rifle Large Bore [WL 5.75"/146mm][HD .30"/8mm] 1 item
  16. 5.45 Krinkov [WL 2.03"/52mm][HD .32"/8mm] 1 item
  17. 7.62 Krinkov [WL 2.22"/56mm][HD .31"/8mm] 1 item
  18. Bulgarian 5.45 Krinkov [WL 2.03"/52mm][HD .42"/11mm] 1 item
  19. Bulgarian AK74 [WL 5.62"/143mm][HD .42"/11mm] 1 item
  20. DRACO [WL 4.78"/121mm][HD .32"/8mm] 1 item
  21. Galil Ace [WL 2.15"/118mm][HD .32"/8mm] 1 item
  22. M85 [WL 4.41"/112mm][HD .31"/8mm] 1 item
  23. M92 2.218 [WL 3.90"/99mm][HD .30"/8mm] 1 item
  24. PSL [WL 3.90"/99mm][HD .30"/8mm] 1 item
  25. Valmet M76 / Galil Classic ARM [WL 4.20"/107mm][HD .45"/11mm] 1 item
  26. VEPR Small Bore [WL 5.62"/143mm][HD .32"/8mm] 1 item
  27. VEPR Big Bore [WL 5.62"/143mm][HD .32"/8mm] 1 item
  28. WZ89 Onyks [WL 2.15"/55mm][HD .32"/8mm] 1 item
Finish
  1. Black 5 items
  2. Black Nitride 1 item
  3. Case Hardened 1 item
  4. Carbon Fiber 1 item
  5. DLC 3 items
  6. FDE 1 item
  7. Nickel Boron 2 items
  8. Nitride 35 items
  9. Phosphate 4 items
  10. Satin 1 item
  11. Anodize 14 items
  12. PVD/CVD 1 item
  13. Quench Polish Quench (QPQ) 2 items
  14. Titanium Nitride (TiN) 1 item
Gas Block Diameter
  1. .625" 13 items
  2. .750" 35 items
  3. .875" 4 items
  4. .936" 4 items
Gas System Length
  1. Blowback 4 items
  2. Pistol -1 1 item
  3. Pistol 10 items
  4. Carbine 9 items
  5. Mid 17 items
  6. Intermediate 3 items
  7. Rifle 3 items
Inside Diameter
  1. 1.3" 1 item
  2. 1.31" 1 item
  3. 1.315" 1 item
  4. 1.34" 1 item
  5. 1.54" 1 item
Manufacturer
  1. A3 Tactical 7 items
  2. Aero Precision 5 items
  3. Airborne Arms 2 items
  4. ALG Defense 1 item
  5. Andro Corp Industries 1 item
  6. Angstadt Arms 2 items
  7. Arisaka 1 item
  8. Arms Republic 1 item
  9. Brügger & Thomet (B&T) 1 item
  10. B5 Systems 3 items
  11. Ballistic Advantage 7 items
  12. Battle Arms Development 3 items
  13. Blitzkrieg Components 2 items
  14. BOBRO 1 item
  15. Bravo Company MFG (BCM) 5 items
  16. Brigand Arms 1 item
  17. Centurion Arms 5 items
  18. Chisel Machining 1 item
  19. CMC Triggers 1 item
  20. Cross Machine Tool (CMT) 2 items
  21. Dead Air Armament 1 item
  22. Dead Foot Arms LLC 1 item
  23. Devil Dog Concepts 1 item
  24. DPM Systems Technologies 3 items
  25. F-1 Firearms 1 item
  26. F5 MFG 1 item
  27. Faxon Firearms 21 items
  28. Fortis MFG 9 items
  29. Forward Controls Design 11 items
  30. Gear Head Works 3 items
  31. Geissele 2 items
  32. Grey Birch MFG 1 item
  33. Griffin Armament 4 items
  34. HB Industries 1 item
  35. Hiperfire 2 items
  36. HUXWRX 1 item
  37. Icon Defense 3 items
  38. Iron City Rifle Works 1 item
  39. Jacob Grey 1 item
  40. JK Armament 1 item
  41. JL Billet 1 item
  42. JMAC Customs 32 items
  43. JP Enterprises Inc 14 items
  44. Killer Innovations 1 item
  45. Kinetic Development Group 1 item
  46. Knight’s Armament Company (KAC) 1 item
  47. KNS Precision 2 items
  48. Krebs Customs 1 item
  49. KynSHOT 3 items
  50. Lantac 9 items
  51. Magpul Industries 6 items
  52. Maxim Defense 3 items
  53. Midwest Industries 8 items
  54. Next Level Armament 2 items
  55. Noveske 4 items
  56. Patriot Ordnance Factory (POF) 2 items
  57. Precision Armament 8 items
  58. Quarter Circle 10 1 item
  59. Radian Weapons 4 items
  60. Rainier Arms, LLC 22 items
  61. Rainier Industries 1 item
  62. Rex Silentium 1 item
  63. Riflespeed 2 items
  64. Rise Armament 9 items
  65. Samson Manufacturing Corp. 1 item
  66. SB Tactical 2 items
  67. SCALARWORKS 1 item
  68. Sharps Bros 5 items
  69. Sig Sauer 3 items
  70. SLR Rifleworks 2 items
  71. Sons of Liberty Gun Works 15 items
  72. Spinta Precision 2 items
  73. Stern Defense 7 items
  74. Strike Industries 1 item
  75. Superlative Arms 4 items
  76. Surefire 7 items
  77. Timney Triggers 4 items
  78. Torrent Suppressors 1 item
  79. Triggertech 5 items
  80. Tyrant Designs 4 items
  81. V Seven Weapon Systems 5 items
  82. VLTOR 1 item
Model
  1. CZ Scorpion 5 items
  2. Sig MCX 2 items
  3. Sig MPX 3 items
Mount
  1. M-LOK 19 items
  2. Picatinny 11 items
Option
  1. AK-47/74 1 item
  2. AR-9 2 items
  3. AR-10 8 items
  4. AR-15 36 items
  5. Standard 1 item
  6. Front 1 item
  7. Mid 1 item
  8. Rear 1 item
  9. WA 1 item
  10. KS 1 item
  11. Heavy 1 item
  12. CZ 5 items
  13. Sharps Bros 1 item
  14. Sig Sauer 1 item
  15. Small Lever 1 item
  16. Large Lever 1 item
  17. Adjustable 5 items
  18. Non-Adjustable 2 items
Platform
  1. 10-22 1 item
  2. AR-9 2 items
  3. AR-10/LR308 6 items
  4. AR-15 61 items
  5. AK47/74 4 items
  6. CZ 5 items
  7. Ruger 10/22 2 items
  8. Sig Sauer 4 items
Product Type
  1. 10/22 Barrel 3 items
  2. 10/22 Receiver 1 item
  3. AK Accessories 1 item
  4. Angled Grip 1 item
  5. AR-10/LR308 Barrel 1 item
  6. AR-10 / LR 308 Charging Handle 2 items
  7. AR-10 Stripped Lower Receiver 1 item
  8. AR-10 Stripped Upper Receiver 1 item
  9. AR-15 Assembled Upper Receiver 2 items
  10. AR-15 Barrel 43 items
  11. AR-15 Charging Handle 7 items
  12. AR-15 Handguard 15 items
  13. AR-15 Rifle 1 item
  14. AR-15 Stripped Lower Receiver 14 items
  15. AR-15 Stripped Upper Receiver 10 items
  16. AR-9 Lower Receiver 1 item
  17. Blast Shield 1 item
  18. Bolt 8 items
  19. Bolt Carrier Group 17 items
  20. Brace 9 items
  21. Buffer 8 items
  22. Buffer Kit 2 items
  23. Buffer Spring 6 items
  24. Buffer Tube 1 item
  25. Charging Handle 6 items
  26. Chassis 1 item
  27. Compensator 7 items
  28. Flash Hider 20 items
  29. Gas Block 8 items
  30. Handguard 17 items
  31. Iron Sight 1 item
  32. Lower Parts Kit 2 items
  33. Lower Receiver 1 item
  34. Muzzle Brake 39 items
  35. Muzzle Device Accessory 4 items
  36. Parts Kit 1 item
  37. Pistol Grip 8 items
  38. Piston 1 item
  39. Piston System 2 items
  40. Rail Adapter 2 items
  41. Recoil Spring 1 item
  42. Silent Captured Spring 1 item
  43. Stock 17 items
  44. Stock Accessory 4 items
  45. Stock Adapter 7 items
  46. Trigger 28 items
  47. Vertical Grip 2 items
Rail Length
  1. 4.25" 3 items
  2. 4.5" 2 items
  3. 5.5" 1 item
  4. 6.0" 1 item
  5. 6.25" 2 items
  6. 6.5" 1 item
  7. 6.7" 3 items
  8. 6.75" 3 items
  9. 7" 4 items
  10. 7.5" 2 items
  11. 7.9" 1 item
  12. 8" 1 item
  13. 8.6" 1 item
  14. 9" 3 items
  15. 9.1" 1 item
  16. 9.5" 5 items
  17. 9.55" 1 item
  18. 9.6" 2 items
  19. 10" 3 items
  20. 10.3" 1 item
  21. 10.5" 6 items
  22. 10.7" 2 items
  23. 11.5" 4 items
  24. 11.7" 2 items
  25. 12" 4 items
  26. 12.3" 1 item
  27. 12.4" 2 items
  28. 12.5" 6 items
  29. 12.6" 1 item
  30. 12.8" 1 item
  31. 13" 2 items
  32. 13.5" 3 items
  33. 13.7" 3 items
  34. 13.8" 2 items
  35. 14" 2 items
  36. 14.3" 1 item
  37. 15" 11 items
  38. 15.3" 2 items
  39. 16.3" 1 item
Size
  1. Medium 1 item
  2. Large 1 item
  3. 5 Slot 1 item
  4. 1.9" 2 items
  5. 2.1" 2 items
  6. 3.3" 2 items
  7. 4.3" 2 items
  8. 4.8" 2 items
  9. 5.8" 2 items
Thread Pitch
  1. .578x28 1 item
  2. 1.375-24 1 item
  3. 1/2x28 (9mm) 4 items
  4. 1/2x28 (.22 cal) 64 items
  5. 1/2x36 3 items
  6. 5/8x24 (.30 cal) 27 items
  7. M13.5x1 LH 1 item
  8. M14x1 LH 5 items
  9. M24x1.5 RH 1 item
  10. 26-1.5 LH 1 item
Threaded
  1. Yes 6 items
Twist Rate
  1. 1:7 20 items
  2. 1:8 19 items
  3. 1:10 4 items
  4. 1:16 3 items
Stock Status
  1. In stock 328 items Remove This Item
  2. Out of stock 1 item
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