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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. 9" 1 item
  9. 10" 1 item
  10. 10.3" 1 item
  11. 10.5" 6 items
  12. 10.7" 2 items
  13. 11.5" 3 items
  14. 12.5" 2 items
  15. 13.7" 1 item
  16. 13.9" 1 item
  17. 14.5" 4 items
  18. 16" 8 items
  19. 17" 1 item
  20. 18" 5 items
  21. 20" 1 item
Barrel Profile
  1. Lightweight 3 items
Caliber
  1. .22 LR 1 item
  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 7 items
  10. 5.56 NATO 35 items
  11. 5.56mm 2 items
  12. 6.5 Creedmoor 1 item
  13. 6.8 SPC 1 item
  14. 7.62mm 2 items
  15. 7.62x39 4 items
  16. 7.62x51 1 item
  17. 9mm 8 items
Category
  1. Receiver Parts 31 items
  2. Parts & Kits 6 items
  3. Barrels 42 items
  4. Buffer Systems 20 items
  5. Trigger Parts 29 items
  6. Gas Systems 10 items
  7. Muzzle Devices 72 items
  8. Bolt Parts 26 items
  9. Grips 12 items
  10. Charging Handles 15 items
  11. Rifle Handguards 29 items
  12. Stocks & Braces 34 items
Color
Configuration
  1. AR-10 1 item
  2. AR-15 3 items
  3. Curved 10 items
  4. Flat 7 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 1 item
  6. FDE 1 item
  7. Nickel Boron 1 item
  8. Nitride 32 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
Gas Block Diameter
  1. .625" 13 items
  2. .750" 33 items
  3. .875" 4 items
  4. .936" 4 items
Gas System Length
  1. Blowback 4 items
  2. Pistol -1 1 item
  3. Pistol 9 items
  4. Carbine 8 items
  5. Mid 16 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 5 items
  2. Aero Precision 4 items
  3. Airborne Arms 3 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 6 items
  12. Battle Arms Development 3 items
  13. Blitzkrieg Components 1 item
  14. BOBRO 1 item
  15. Bravo Company MFG (BCM) 5 items
  16. Brigand Arms 1 item
  17. Centurion Arms 5 items
  18. CMC Triggers 1 item
  19. Cross Machine Tool (CMT) 2 items
  20. Dead Air Armament 1 item
  21. Dead Foot Arms LLC 1 item
  22. Devil Dog Concepts 1 item
  23. DPM Systems Technologies 3 items
  24. F-1 Firearms 1 item
  25. F5 MFG 1 item
  26. Faxon Firearms 18 items
  27. Fortis MFG 10 items
  28. Forward Controls Design 11 items
  29. Gear Head Works 3 items
  30. Geissele 4 items
  31. Grey Birch MFG 1 item
  32. Griffin Armament 3 items
  33. HB Industries 1 item
  34. Hiperfire 1 item
  35. HUXWRX 3 items
  36. Icon Defense 3 items
  37. Iron City Rifle Works 1 item
  38. JK Armament 1 item
  39. JL Billet 1 item
  40. JMAC Customs 32 items
  41. JP Enterprises Inc 14 items
  42. Killer Innovations 1 item
  43. Knight’s Armament Company (KAC) 2 items
  44. KNS Precision 2 items
  45. Krebs Customs 1 item
  46. KynSHOT 3 items
  47. Lantac 8 items
  48. Magpul Industries 6 items
  49. Maxim Defense 3 items
  50. Midwest Industries 8 items
  51. Next Level Armament 2 items
  52. Noveske 3 items
  53. Patriot Ordnance Factory (POF) 2 items
  54. Precision Armament 7 items
  55. Quarter Circle 10 1 item
  56. Radian Weapons 5 items
  57. Rainier Arms, LLC 21 items
  58. Rainier Industries 2 items
  59. Rex Silentium 1 item
  60. Riflespeed 2 items
  61. Rise Armament 8 items
  62. Samson Manufacturing Corp. 1 item
  63. SB Tactical 2 items
  64. SCALARWORKS 1 item
  65. Sharps Bros 8 items
  66. Sig Sauer 2 items
  67. SLR Rifleworks 2 items
  68. Sons of Liberty Gun Works 14 items
  69. Spinta Precision 2 items
  70. Stern Defense 7 items
  71. Strike Industries 3 items
  72. Superlative Arms 4 items
  73. Surefire 7 items
  74. Timney Triggers 5 items
  75. Torrent Suppressors 1 item
  76. Triggertech 6 items
  77. Tyrant Designs 4 items
  78. V Seven Weapon Systems 5 items
  79. VLTOR 1 item
Model
  1. CZ Scorpion 5 items
  2. Sig MCX 1 item
  3. Sig MPX 3 items
Mount
  1. M-LOK 20 items
  2. Picatinny 11 items
Option
  1. AK-47/74 1 item
  2. AR-10 7 items
  3. AR-15 36 items
  4. Standard 1 item
  5. Front 1 item
  6. WA 1 item
  7. KS 1 item
  8. Heavy 1 item
  9. CZ 5 items
  10. Sharps Bros 1 item
  11. Sig Sauer 1 item
  12. Small Lever 1 item
  13. Large Lever 1 item
  14. Adjustable 5 items
  15. Non-Adjustable 2 items
Platform
  1. 10-22 1 item
  2. AR-9 3 items
  3. AR-10/LR308 6 items
  4. AR-15 60 items
  5. AK47/74 4 items
  6. CZ 5 items
  7. Sig Sauer 3 items
Product Type
  1. 10/22 Barrel 1 item
  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 40 items
  11. AR-15 Charging Handle 7 items
  12. AR-15 Complete Lower Receiver 1 item
  13. AR-15 Handguard 15 items
  14. AR-15 Rifle 1 item
  15. AR-15 Stripped Lower Receiver 14 items
  16. AR-15 Stripped Upper Receiver 9 items
  17. Blast Shield 1 item
  18. Bolt 9 items
  19. Bolt Carrier Group 16 items
  20. Brace 8 items
  21. Buffer 7 items
  22. Buffer Kit 3 items
  23. Buffer Spring 7 items
  24. Buffer Tube 1 item
  25. Charging Handle 6 items
  26. Chassis 1 item
  27. Compensator 7 items
  28. Flash Hider 19 items
  29. Gas Block 8 items
  30. Handguard 17 items
  31. Iron Sight 1 item
  32. Lower Parts Kit 3 items
  33. Muzzle Brake 42 items
  34. Muzzle Device Accessory 4 items
  35. Parts Kit 2 items
  36. Pistol Grip 8 items
  37. Piston 1 item
  38. Piston System 2 items
  39. Rail Adapter 2 items
  40. Recoil Spring 1 item
  41. Stock 16 items
  42. Stock Accessory 4 items
  43. Stock Adapter 6 items
  44. Trigger 29 items
  45. 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. 8.5" 1 item
  14. 8.6" 1 item
  15. 9" 3 items
  16. 9.1" 1 item
  17. 9.5" 5 items
  18. 9.55" 1 item
  19. 9.6" 2 items
  20. 10" 3 items
  21. 10.3" 1 item
  22. 10.5" 6 items
  23. 10.7" 2 items
  24. 11.5" 4 items
  25. 11.7" 2 items
  26. 12" 4 items
  27. 12.3" 1 item
  28. 12.4" 2 items
  29. 12.5" 6 items
  30. 12.6" 1 item
  31. 12.8" 1 item
  32. 13" 2 items
  33. 13.5" 3 items
  34. 13.7" 3 items
  35. 13.8" 2 items
  36. 14" 2 items
  37. 14.3" 1 item
  38. 15" 11 items
  39. 15.3" 2 items
  40. 16.3" 1 item
  41. 17" 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) 61 items
  5. 1/2x36 3 items
  6. 5/8x24 (.30 cal) 26 items
  7. M13.5x1 LH 1 item
  8. M14x1 LH 5 items
  9. M24x1.5 RH 2 items
  10. 26-1.5 LH 1 item
Threaded
  1. Yes 6 items
Twist Rate
  1. 1:7 18 items
  2. 1:8 18 items
  3. 1:10 4 items
  4. 1:16 1 item
Stock Status
  1. In stock 318 items Remove This Item
  2. Out of stock 7 items
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