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raineirarms

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. Surefire Flash Hider/Adapter - SF3P-762-5/8x24
    Surefire Flash Hider/Adapter - SF3P-762-5/8x24
    $152.00
    Out of stock
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  2. JP Enterprises Enhanced Bolt - 6.5 Grendel
    JP Enterprises Enhanced Bolt - 6.5 Grendel
    $142.45
    Out of stock
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  3. Fortis MFG Control Shield 5.56
    Fortis MFG Control Shield 5.56
    $110.15
    Out of stock
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  6. Tyrant Designs MOD Grip Chevron Black
    Tyrant Designs MOD Grip Chevron Black
    Out of stock
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  7. Tyrant Designs MOD Standard Grip Medium
    Tyrant Designs MOD Standard Grip Medium
    $104.35
    Out of stock
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  8. Bootleg Adjustable AR-15 Complete Bolt Carrier Group
    Bootleg Adjustable AR-15 Complete Bolt Carrier Group
    $199.95
    Out of stock
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  9. Hera Arms Side Folding Unit (SFU)
    Hera Arms Side Folding Unit (SFU)
    $119.00
    Out of stock
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  11. Surefire WARCOMP 556 Flash Hider - 1/2X28
    Surefire WARCOMP 556 Flash Hider - 1/2X28
    $152.00
    Out of stock
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  13. Heavy Buffer CAR-10 Buffer and .308 Carbine Buffer Spring
    Heavy Buffer CAR-10 Buffer and .308 Carbine Buffer Spring
    $115.00
    Out of stock
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  14. Rainier Arms Exclusive Faxon Firearms Chrome Lined 300BLK AR-15 Barrel - 8.5"
    Faxon Firearms Chrome Lined 300BLK AR-15 Barrel - 8.5"
    $189.00
    Out of stock
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  16. Faxon Firearms Light Tapered 9mm AR-15 Barrel - 8.5"
    Faxon Firearms Light Tapered 9mm AR-15 Barrel - 8.5"
    $115.00
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Barrel Length
  1. 4" 1 item
  2. 4.5" 1 item
  3. 6" 3 items
  4. 6.5" 1 item
  5. 6.75" 1 item
  6. 7" 1 item
  7. 7.5" 3 items
  8. 8" 4 items
  9. 8.3" 1 item
  10. 8.5" 3 items
  11. 9" 2 items
  12. 10" 1 item
  13. 10.3" 1 item
  14. 10.5" 11 items
  15. 10.7" 2 items
  16. 11" 1 item
  17. 11.5" 5 items
  18. 12.5" 4 items
  19. 13.7" 2 items
  20. 13.9" 2 items
  21. 14.5" 4 items
  22. 16" 12 items
  23. 18" 7 items
  24. 20" 2 items
Barrel Profile
  1. Dissipator 2 items
  2. Lightweight 3 items
  3. MK12 SPR 1 item
Caliber
  1. .223/5.56 6 items
  2. .223 Wylde 3 items
  3. .30 Cal 3 items
  4. .308 6 items
  5. .308 Win 2 items
  6. .38/.357 Magnum 1 item
  7. .45 ACP 3 items
  8. 12 Gauge 1 item
  9. 300 Blackout 17 items
  10. 5.56 NATO 55 items
  11. 5.56mm 2 items
  12. 6.5 Grendel 1 item
  13. 6.8 SPC 1 item
  14. 7.62mm 5 items
  15. 7.62x39 4 items
  16. 7.62x51 2 items
  17. 8.6 Blackout 1 item
  18. 9mm 17 items
Category
  1. Receiver Parts 67 items
  2. Parts & Kits 11 items
  3. Barrels 69 items
  4. Buffer Systems 29 items
  5. Trigger Parts 40 items
  6. Gas Systems 12 items
  7. Muzzle Devices 97 items
  8. Bolt Parts 37 items
  9. Grips 19 items
  10. Charging Handles 21 items
  11. Rifle Handguards 61 items
  12. Stocks & Braces 54 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. Normal CQR 2 items
  9. Restricted CQR 2 items
  10. Straight 4 items
  11. Enhanced Finger Placement (EFP) 1 item
  12. AK74 [WL 5.62"/143mm][HD .32"/8mm] 1 item
  13. AIMS-74 [WL 4.80"/122mm][HD .32"/8mm] 1 item
  14. AK-105 JBI Custom [WL 4.20"/107mm][HD .45"/11mm] 1 item
  15. AKM Large Bore [WL 5.83"/148mm][HD .31"/8mm] 1 item
  16. AMD65 [WL 4.67"/119mm][HD .31"/8mm] 1 item
  17. Arsenal Rifle Small Bore [WL 5.75"/146mm][HD .30"/8mm] 1 item
  18. Arsenal Rifle Large Bore [WL 5.75"/146mm][HD .30"/8mm] 1 item
  19. 5.45 Krinkov [WL 2.03"/52mm][HD .32"/8mm] 1 item
  20. 7.62 Krinkov [WL 2.22"/56mm][HD .31"/8mm] 1 item
  21. Bulgarian 5.45 Krinkov [WL 2.03"/52mm][HD .42"/11mm] 1 item
  22. Bulgarian AK74 [WL 5.62"/143mm][HD .42"/11mm] 1 item
  23. DRACO [WL 4.78"/121mm][HD .32"/8mm] 1 item
  24. Galil Ace [WL 2.15"/118mm][HD .32"/8mm] 1 item
  25. M85 [WL 4.41"/112mm][HD .31"/8mm] 1 item
  26. M92 2.218 [WL 3.90"/99mm][HD .30"/8mm] 1 item
  27. PSL [WL 3.90"/99mm][HD .30"/8mm] 1 item
  28. Valmet M76 / Galil Classic ARM [WL 4.20"/107mm][HD .45"/11mm] 1 item
  29. VEPR Small Bore [WL 5.62"/143mm][HD .32"/8mm] 1 item
  30. VEPR Big Bore [WL 5.62"/143mm][HD .32"/8mm] 1 item
  31. WZ89 Onyks [WL 2.15"/55mm][HD .32"/8mm] 1 item
Finish
  1. Black 6 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 44 items
  11. Phosphate 7 items
  12. Satin 1 item
  13. Anodize 22 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" 50 items
  3. .875" 4 items
  4. .936" 4 items
Gas System Length
  1. Blowback 9 items
  2. Pistol -1 1 item
  3. Pistol 18 items
  4. Carbine 15 items
  5. Mid 17 items
  6. Intermediate 4 items
  7. Rifle 6 items
Inside Diameter
  1. 1.3" 2 items
  2. 1.31" 1 item
  3. 1.315" 4 items
  4. 1.34" 2 items
  5. 1.385" 1 item
  6. 1.4" 1 item
  7. 1.42" 1 item
  8. 1.5" 1 item
  9. 1.54" 1 item
Manufacturer
  1. A3 Tactical 7 items
  2. Aero Precision 28 items
  3. Aeroknox 1 item
  4. Airborne Arms 3 items
  5. ALG Defense 2 items
  6. Andro Corp Industries 1 item
  7. Angstadt Arms 5 items
  8. Arisaka 1 item
  9. Arms Republic 2 items
  10. Brügger & Thomet (B&T) 1 item
  11. B5 Systems 5 items
  12. Ballistic Advantage 19 items
  13. Battle Arms Development 6 items
  14. Blitzkrieg Components 2 items
  15. BOBRO 1 item
  16. Bootleg 2 items
  17. Bravo Company MFG (BCM) 5 items
  18. Brigand Arms 1 item
  19. Centurion Arms 5 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 2 items
  27. F-1 Firearms 1 item
  28. F5 MFG 2 items
  29. Faxon Firearms 34 items
  30. Ferfrans 1 item
  31. Fortis MFG 12 items
  32. Forward Controls Design 10 items
  33. Gear Head Works 5 items
  34. Geissele 7 items
  35. Grey Birch MFG 1 item
  36. Griffin Armament 6 items
  37. HB Industries 3 items
  38. HERA ARMS 8 items
  39. Hiperfire 9 items
  40. HUXWRX 5 items
  41. Icon Defense 4 items
  42. Iron City Rifle Works 1 item
  43. Jacob Grey 1 item
  44. JK Armament 1 item
  45. JL Billet 2 items
  46. JMAC Customs 37 items
  47. JP Enterprises Inc 14 items
  48. Killer Innovations 1 item
  49. Kinetic Development Group 2 items
  50. Knight’s Armament Company (KAC) 4 items
  51. KNS Precision 2 items
  52. Kalashnikov USA 1 item
  53. Krebs Customs 1 item
  54. KynSHOT 6 items
  55. Lantac 11 items
  56. Magpul Industries 7 items
  57. Maxim Defense 3 items
  58. Midwest Industries 20 items
  59. NEMO Arms 2 items
  60. Next Level Armament 5 items
  61. Noveske 5 items
  62. Patriot Ordnance Factory (POF) 2 items
  63. Precision Armament 11 items
  64. Primary Weapon Systems 2 items
  65. Q, LLC 2 items
  66. Quarter Circle 10 1 item
  67. Radian Weapons 6 items
  68. Raidworx 1 item
  69. Rainier Arms, LLC 26 items
  70. Rainier Industries 2 items
  71. Reptilia Corp 4 items
  72. Rex Silentium 1 item
  73. Riflespeed 2 items
  74. Rise Armament 10 items
  75. SB Tactical 4 items
  76. SCALARWORKS 1 item
  77. Seekins Precision 1 item
  78. Sharps Bros 6 items
  79. Sig Sauer 2 items
  80. Silencerco 1 item
  81. Sionics Weapon Systems 1 item
  82. SLR Rifleworks 2 items
  83. Sons of Liberty Gun Works 18 items
  84. Spinta Precision 4 items
  85. Stern Defense 7 items
  86. Strike Industries 1 item
  87. Superlative Arms 4 items
  88. Surefire 9 items
  89. Timney Triggers 5 items
  90. Torrent Suppressors 1 item
  91. Triggertech 6 items
  92. Troy Industries 1 item
  93. Tyrant Designs 8 items
  94. V Seven Weapon Systems 7 items
  95. VKTR Industries 1 item
  96. VLTOR 2 items
  97. WMD Guns 3 items
Model
  1. CZ Scorpion 5 items
  2. IWI Galil 1 item
  3. Sig MCX 3 items
  4. Sig MPX 3 items
Mount
  1. M-LOK 34 items
  2. Picatinny 15 items
Option
  1. AK-47/74 3 items
  2. AR-9 4 items
  3. AR-10 13 items
  4. AR-15 81 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 6 items
  13. Glock 1 item
  14. Heckler & Koch 1 item
  15. Sharps Bros 1 item
  16. Sig Sauer 1 item
  17. Small Lever 1 item
  18. Large Lever 1 item
  19. Adjustable 5 items
  20. Non-Adjustable 2 items
Platform
  1. 10-22 1 item
  2. AR-9 3 items
  3. AR-10/LR308 5 items
  4. AR-15 97 items
  5. AK47/74 3 items
  6. CZ 5 items
  7. IWI 1 item
  8. Sig Sauer 6 items
Price
  1. $100.00 - $109.99 63 items
  2. $110.00 - $119.99 55 items
  3. $120.00 - $129.99 54 items
  4. $130.00 - $139.99 50 items
  5. $140.00 - $149.99 63 items
  6. $150.00 - $159.99 61 items
  7. $160.00 - $169.99 37 items
  8. $170.00 - $179.99 46 items
  9. $180.00 - $189.99 30 items
  10. $190.00 and above 54 items
Product Type
  1. 10/22 Receiver 1 item
  2. AK Accessories 1 item
  3. Angled Grip 1 item
  4. AR-10/LR308 Barrel 1 item
  5. AR-10 / LR 308 Charging Handle 5 items
  6. AR-10 Complete Upper Receiver 1 item
  7. AR-10 Handguard 3 items
  8. AR-10 Stripped Lower Receiver 1 item
  9. AR-10 Stripped Upper Receiver 1 item
  10. AR-15 Assembled Upper Receiver 4 items
  11. AR-15 Barrel 68 items
  12. AR-15 Charging Handle 11 items
  13. AR-15 Handguard 29 items
  14. AR-15 Rifle 1 item
  15. AR-15 Stripped Lower Receiver 30 items
  16. AR-15 Stripped Upper Receiver 24 items
  17. AR-9 Lower Receiver 2 items
  18. Blast Shield 2 items
  19. Bolt 8 items
  20. Bolt Carrier Group 31 items
  21. Brace 12 items
  22. Buffer 11 items
  23. Buffer Kit 5 items
  24. Buffer Spring 8 items
  25. Buffer Tube 3 items
  26. Builders Kit 1 item
  27. Charging Handle 7 items
  28. Chassis 1 item
  29. Compensator 10 items
  30. Flash Hider 27 items
  31. Forearm Accesory 1 item
  32. Gas Block 8 items
  33. Handguard 29 items
  34. Iron Sight 1 item
  35. Lower Parts Kit 5 items
  36. Lower Receiver 1 item
  37. Muzzle Brake 51 items
  38. Muzzle Device Accessory 8 items
  39. Parts Kit 1 item
  40. Pistol Grip 11 items
  41. Piston 1 item
  42. Piston System 4 items
  43. Rail Adapter 4 items
  44. Rail Section 1 item
  45. Safety Selector 1 item
  46. Silent Captured Spring 1 item
  47. Stock 26 items
  48. Stock Accessory 6 items
  49. Stock Adapter 10 items
  50. Trigger 40 items
  51. Vertical Grip 2 items
Rail Length
  1. 3" 1 item
  2. 4" 2 items
  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" 8 items
  12. 7.25" 1 item
  13. 7.5" 2 items
  14. 7.9" 1 item
  15. 8" 1 item
  16. 8.25" 1 item
  17. 8.6" 1 item
  18. 9" 6 items
  19. 9.1" 1 item
  20. 9.2" 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. 11.25" 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" 5 items
  40. 13.5" 4 items
  41. 13.7" 6 items
  42. 13.8" 3 items
  43. 14" 2 items
  44. 14.3" 1 item
  45. 15" 24 items
  46. 15.3" 3 items
  47. 16.3" 1 item
  48. 16.5" 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) 9 items
  5. 1/2x28 (.22 cal) 82 items
  6. 1/2x36 4 items
  7. 5/8x24 (.30 cal) 43 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 11 items
Twist Rate
  1. 1:5 2 items
  2. 1:7 29 items
  3. 1:8 26 items
  4. 1:10 11 items
Stock Status
  1. In stock 306 items
  2. Out of stock 207 items
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