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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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  2. Icon Defense AR-15 Forged Lower Receiver - Black
    Icon Defense AR-15 Forged Lower Receiver - Black
    $123.99
    Out of stock
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  3. Spinta Precision AR-15 300BLK Cold Hammer Forged Barrel - 8" (Limited Production)
    Spinta Precision AR-15 300BLK Cold Hammer Forged Barrel - 8" (Limited Production)
    Special Price $149.99 Regular Price $199.99
    Out of stock
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  6. Huxwrx Flash Hider-QD 762 Suppressor Mount - 5/8x24
    Huxwrx Flash Hider-QD 762 Suppressor Mount - 5/8x24
    $142.00
    Out of stock
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  13. Aero Precision EPC-9 Lower Receiver - Black
    Aero Precision EPC-9 Lower Receiver - Black
    $169.99
    Out of stock
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Items 337-352 of 521

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Barrel Length
  1. 4" 1 item
  2. 6" 4 items
  3. 6.5" 1 item
  4. 6.75" 1 item
  5. 7" 1 item
  6. 7.5" 3 items
  7. 8" 4 items
  8. 8.3" 1 item
  9. 8.5" 2 items
  10. 9" 2 items
  11. 10" 1 item
  12. 10.3" 1 item
  13. 10.5" 11 items
  14. 10.7" 2 items
  15. 11" 1 item
  16. 11.5" 5 items
  17. 12.5" 5 items
  18. 13.7" 2 items
  19. 13.9" 2 items
  20. 14.5" 4 items
  21. 16" 12 items
  22. 17" 1 item
  23. 18" 7 items
  24. 20" 3 items
Barrel Profile
  1. Dissipator 2 items
  2. Lightweight 3 items
  3. MK12 SPR 1 item
Caliber
  1. .22 LR 1 item
  2. .223/5.56 6 items
  3. .223 Wylde 3 items
  4. .30 Cal 3 items
  5. .308 6 items
  6. .308 Win 2 items
  7. .38/.357 Magnum 1 item
  8. .45 ACP 3 items
  9. 12 Gauge 1 item
  10. 300 Blackout 16 items
  11. 5.56 NATO 56 items
  12. 5.56mm 2 items
  13. 6.5 Creedmoor 1 item
  14. 6.5 Grendel 2 items
  15. 6.8 SPC 1 item
  16. 7.62mm 5 items
  17. 7.62x39 4 items
  18. 7.62x51 2 items
  19. 8.6 Blackout 1 item
  20. 9mm 16 items
Category
  1. Receiver Parts 64 items
  2. Parts & Kits 11 items
  3. Barrels 70 items
  4. Buffer Systems 32 items
  5. Trigger Parts 41 items
  6. Gas Systems 13 items
  7. Muzzle Devices 98 items
  8. Bolt Parts 44 items
  9. Grips 19 items
  10. Charging Handles 23 items
  11. Rifle Handguards 59 items
  12. Stocks & Braces 53 items
Color
Configuration
  1. AR-10 1 item
  2. AR-15 6 items
  3. Carbine 1 item
  4. Curved 11 items
  5. Flat 8 items
  6. Gen 3 1 item
  7. M-LOK 2 items
  8. Straight 4 items
  9. Enhanced Finger Placement (EFP) 1 item
  10. AK74 [WL 5.62"/143mm][HD .32"/8mm] 1 item
  11. AIMS-74 [WL 4.80"/122mm][HD .32"/8mm] 1 item
  12. AK-105 JBI Custom [WL 4.20"/107mm][HD .45"/11mm] 1 item
  13. AKM Large Bore [WL 5.83"/148mm][HD .31"/8mm] 1 item
  14. AMD65 [WL 4.67"/119mm][HD .31"/8mm] 1 item
  15. Arsenal Rifle Small Bore [WL 5.75"/146mm][HD .30"/8mm] 1 item
  16. Arsenal Rifle Large Bore [WL 5.75"/146mm][HD .30"/8mm] 1 item
  17. 5.45 Krinkov [WL 2.03"/52mm][HD .32"/8mm] 1 item
  18. 7.62 Krinkov [WL 2.22"/56mm][HD .31"/8mm] 1 item
  19. Bulgarian 5.45 Krinkov [WL 2.03"/52mm][HD .42"/11mm] 1 item
  20. Bulgarian AK74 [WL 5.62"/143mm][HD .42"/11mm] 1 item
  21. DRACO [WL 4.78"/121mm][HD .32"/8mm] 1 item
  22. Galil Ace [WL 2.15"/118mm][HD .32"/8mm] 1 item
  23. M85 [WL 4.41"/112mm][HD .31"/8mm] 1 item
  24. M92 2.218 [WL 3.90"/99mm][HD .30"/8mm] 1 item
  25. PSL [WL 3.90"/99mm][HD .30"/8mm] 1 item
  26. Valmet M76 / Galil Classic ARM [WL 4.20"/107mm][HD .45"/11mm] 1 item
  27. VEPR Small Bore [WL 5.62"/143mm][HD .32"/8mm] 1 item
  28. VEPR Big Bore [WL 5.62"/143mm][HD .32"/8mm] 1 item
  29. WZ89 Onyks [WL 2.15"/55mm][HD .32"/8mm] 1 item
Finish
  1. Black 5 items
  2. Black Nitride 2 items
  3. Case Hardened 1 item
  4. Carbon Fiber 1 item
  5. Cerakote 3 items
  6. DLC 3 items
  7. FDE 1 item
  8. Melonite 1 item
  9. Nickel Boron 3 items
  10. Nitride 46 items
  11. Phosphate 7 items
  12. Satin 1 item
  13. Anodize 25 items
  14. PVD/CVD 1 item
  15. Quench Polish Quench (QPQ) 3 items
  16. Titanium Nitride (TiN) 1 item
Gas Block Diameter
  1. .625" 15 items
  2. .750" 51 items
  3. .875" 4 items
  4. .936" 4 items
Gas System Length
  1. Blowback 8 items
  2. Pistol -1 1 item
  3. Pistol 17 items
  4. Carbine 15 items
  5. Mid 18 items
  6. Intermediate 4 items
  7. Rifle 7 items
Inside Diameter
  1. 1.3" 2 items
  2. 1.31" 1 item
  3. 1.315" 4 items
  4. 1.34" 2 items
  5. 1.4" 1 item
  6. 1.42" 1 item
  7. 1.5" 1 item
  8. 1.54" 1 item
Manufacturer
  1. A3 Tactical 7 items
  2. Aero Precision 28 items
  3. Aeroknox 1 item
  4. Airborne Arms 2 items
  5. ALG Defense 2 items
  6. Andro Corp Industries 1 item
  7. Angstadt Arms 5 items
  8. Arisaka 1 item
  9. Arms Republic 1 item
  10. Brügger & Thomet (B&T) 1 item
  11. B5 Systems 7 items
  12. Ballistic Advantage 19 items
  13. Battle Arms Development 8 items
  14. Blitzkrieg Components 2 items
  15. BOBRO 1 item
  16. Bootleg 1 item
  17. Bravo Company MFG (BCM) 5 items
  18. Brigand Arms 1 item
  19. Centurion Arms 6 items
  20. Chisel Machining 2 items
  21. CMC Triggers 1 item
  22. Cross Machine Tool (CMT) 8 items
  23. Dead Air Armament 1 item
  24. Dead Foot Arms LLC 1 item
  25. Devil Dog Concepts 1 item
  26. DPM Systems Technologies 3 items
  27. F-1 Firearms 1 item
  28. F5 MFG 2 items
  29. Faxon Firearms 32 items
  30. Ferfrans 1 item
  31. Fortis MFG 12 items
  32. Forward Controls Design 11 items
  33. Gear Head Works 5 items
  34. Geissele 8 items
  35. Grey Birch MFG 1 item
  36. Griffin Armament 5 items
  37. HB Industries 4 items
  38. HERA ARMS 2 items
  39. Hiperfire 9 items
  40. HUXWRX 7 items
  41. Icon Defense 4 items
  42. Iron City Rifle Works 1 item
  43. JK Armament 1 item
  44. JL Billet 1 item
  45. JMAC Customs 37 items
  46. JP Enterprises Inc 17 items
  47. Killer Innovations 1 item
  48. Kinetic Development Group 1 item
  49. Knight’s Armament Company (KAC) 6 items
  50. KNS Precision 3 items
  51. Kalashnikov USA 1 item
  52. Krebs Customs 1 item
  53. KynSHOT 6 items
  54. Lantac 11 items
  55. Magpul Industries 7 items
  56. Maxim Defense 3 items
  57. Midwest Industries 20 items
  58. NEMO Arms 2 items
  59. Next Level Armament 5 items
  60. Noveske 5 items
  61. Patriot Ordnance Factory (POF) 2 items
  62. Precision Armament 11 items
  63. Primary Weapon Systems 2 items
  64. Q, LLC 2 items
  65. Quarter Circle 10 1 item
  66. Radian Weapons 6 items
  67. Raidworx 1 item
  68. Rainier Arms, LLC 27 items
  69. Rainier Industries 2 items
  70. Reptilia Corp 4 items
  71. Rex Silentium 1 item
  72. Riflespeed 2 items
  73. Rise Armament 10 items
  74. Samson Manufacturing Corp. 1 item
  75. SB Tactical 4 items
  76. SCALARWORKS 1 item
  77. Sharps Bros 8 items
  78. Sig Sauer 3 items
  79. Silencerco 1 item
  80. Sionics Weapon Systems 1 item
  81. SLR Rifleworks 2 items
  82. Sons of Liberty Gun Works 18 items
  83. Spinta Precision 4 items
  84. Stern Defense 7 items
  85. Strike Industries 3 items
  86. Superlative Arms 4 items
  87. Surefire 9 items
  88. Timney Triggers 5 items
  89. Torrent Suppressors 1 item
  90. Triggertech 6 items
  91. Troy Industries 1 item
  92. Tyrant Designs 8 items
  93. V Seven Weapon Systems 7 items
  94. VKTR Industries 1 item
  95. VLTOR 2 items
  96. WMD Guns 3 items
Model
  1. CZ Bren 1 item
  2. CZ Scorpion 5 items
  3. FNH Scar 1 item
  4. IWI Galil 1 item
  5. Sig MCX 3 items
  6. Sig MPX 3 items
Mount
  1. M-LOK 33 items
  2. Picatinny 16 items
Option
  1. AK-47/74 3 items
  2. AR-9 4 items
  3. AR-10 11 items
  4. AR-15 75 items
  5. Standard 1 item
  6. Front 1 item
  7. WA 1 item
  8. KS 1 item
  9. Heavy 1 item
  10. CZ 6 items
  11. Glock 1 item
  12. Heckler & Koch 1 item
  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 3 items
  3. AR-10/LR308 7 items
  4. AR-15 98 items
  5. AK47/74 6 items
  6. CZ 5 items
  7. FNH 1 item
  8. IWI 1 item
  9. Sig Sauer 6 items
Price
  1. $100.00 - $109.99 67 items
  2. $110.00 - $119.99 57 items
  3. $120.00 - $129.99 51 items
  4. $130.00 - $139.99 46 items
  5. $140.00 - $149.99 66 items
  6. $150.00 - $159.99 58 items
  7. $160.00 - $169.99 39 items
  8. $170.00 - $179.99 48 items
  9. $180.00 - $189.99 33 items
  10. $190.00 and above 56 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 2 items
  6. AR-10 / LR 308 Charging Handle 5 items
  7. AR-10 Complete Upper Receiver 1 item
  8. AR-10 Handguard 2 items
  9. AR-10 Stripped Lower Receiver 1 item
  10. AR-10 Stripped Upper Receiver 1 item
  11. AR-15 Assembled Upper Receiver 4 items
  12. AR-15 Barrel 67 items
  13. AR-15 Charging Handle 11 items
  14. AR-15 Handguard 25 items
  15. AR-15 Rifle 1 item
  16. AR-15 Stripped Lower Receiver 29 items
  17. AR-15 Stripped Upper Receiver 22 items
  18. AR-9 Lower Receiver 2 items
  19. Blast Shield 2 items
  20. Bolt 11 items
  21. Bolt Carrier Group 31 items
  22. Brace 12 items
  23. Buffer 11 items
  24. Buffer Kit 6 items
  25. Buffer Spring 8 items
  26. Buffer Tube 4 items
  27. Builders Kit 1 item
  28. Charging Handle 8 items
  29. Chassis 1 item
  30. Compensator 9 items
  31. Flash Hider 28 items
  32. Forearm Accesory 1 item
  33. Gas Block 9 items
  34. Handguard 32 items
  35. Iron Sight 1 item
  36. Lower Parts Kit 5 items
  37. Lower Receiver 1 item
  38. Muzzle Brake 52 items
  39. Muzzle Device Accessory 8 items
  40. Parts Kit 3 items
  41. Pistol Grip 11 items
  42. Piston 1 item
  43. Piston System 4 items
  44. Rail Adapter 4 items
  45. Rail Section 1 item
  46. Recoil Spring 1 item
  47. Safety Selector 1 item
  48. Silent Captured Spring 1 item
  49. Stock 25 items
  50. Stock Accessory 7 items
  51. Stock Adapter 9 items
  52. Trigger 41 items
  53. Vertical Grip 2 items
Rail Length
  1. 3" 1 item
  2. 4" 1 item
  3. 4.25" 3 items
  4. 4.5" 2 items
  5. 5.5" 2 items
  6. 6.0" 3 items
  7. 6.25" 2 items
  8. 6.5" 1 item
  9. 6.7" 6 items
  10. 6.75" 3 items
  11. 7" 6 items
  12. 7.25" 1 item
  13. 7.5" 2 items
  14. 7.9" 2 items
  15. 8" 1 item
  16. 8.25" 1 item
  17. 8.5" 1 item
  18. 8.6" 1 item
  19. 9" 4 items
  20. 9.1" 1 item
  21. 9.5" 8 items
  22. 9.55" 1 item
  23. 9.6" 3 items
  24. 10" 3 items
  25. 10.25" 1 item
  26. 10.3" 1 item
  27. 10.5" 10 items
  28. 10.7" 2 items
  29. 10.8" 1 item
  30. 11.5" 4 items
  31. 11.7" 2 items
  32. 12" 6 items
  33. 12.3" 1 item
  34. 12.4" 3 items
  35. 12.5" 7 items
  36. 12.6" 1 item
  37. 12.625" 1 item
  38. 12.8" 1 item
  39. 13" 4 items
  40. 13.5" 3 items
  41. 13.7" 6 items
  42. 13.8" 4 items
  43. 14" 2 items
  44. 14.3" 1 item
  45. 15" 20 items
  46. 15.3" 3 items
  47. 15.8" 1 item
  48. 16.3" 1 item
  49. 17" 1 item
Size
  1. BACK STRAP:Large 1 item
  2. BACK STRAP:Medium 2 items
  3. Medium 1 item
  4. Large 1 item
  5. 5 Slot 1 item
  6. 9 Slot 1 item
  7. 1.9" 2 items
  8. 2.1" 2 items
  9. 3.3" 2 items
  10. 4.3" 2 items
  11. 4.8" 2 items
  12. 5.8" 2 items
Thread Pitch
  1. 1.125x28 1 item
  2. .578x28 1 item
  3. 1.375-24 1 item
  4. 1/2x28 (9mm) 8 items
  5. 1/2x28 (.22 cal) 83 items
  6. 1/2x36 4 items
  7. 5/8x24 (.30 cal) 44 items
  8. M13.5x1 LH 1 item
  9. M14x1 LH 6 items
  10. M24x1.5 RH 2 items
  11. 26-1.5 LH 1 item
Threaded
  1. Yes 12 items
Twist Rate
  1. 1:5 2 items
  2. 1:7 29 items
  3. 1:8 27 items
  4. 1:10 10 items
  5. 1:16 1 item
Stock Status
  1. In stock 326 items
  2. Out of stock 195 items
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