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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. Aero Precision Low Profile Gas Block - .750 Nitride
    Aero Precision Low Profile Gas Block - .750 Nitride
    $35.99
    Out of stock
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  2. Geissele Super 700 Trigger
    Geissele Super 700 Trigger
    $250.00
    Out of stock
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  3. Primary Weapon Systems Enhanced Steel Body Buffer - Carbine H4/9mm (Suppressor Optimized)
    Primary Weapon Systems Enhanced Steel Body Buffer - Carbine H4/9mm (Suppressor Optimized)
    $84.96
    Out of stock
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  4. Aero Precision Upper Parts Kit
    Aero Precision Upper Parts Kit
    Out of stock
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  5. Primary Weapons Systems Enhanced Steel Body Buffer - Carbine H3 5.1 oz
    Primary Weapons Systems Enhanced Steel Body Buffer - Carbine H3 5.1 oz
    $49.95
    Out of stock
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  6. Triggertech Sig Sauer MCX Trigger - PVD Black
    Triggertech Sig Sauer MCX Trigger - PVD Black
    Out of stock
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  7. Battle Arms Development BAD-ASS Elite Ambidextrous Safety Selector
    Battle Arms Development BAD-ASS Elite Ambidextrous Safety Selector
    $74.95
    Out of stock
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  8. Battle Arms Development Lightweight Low Profile Steel Gas Block - .750 Black
    Battle Arms Development Lightweight Low Profile Steel Gas Block - .750 Black
    $35.99
    Out of stock
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  9. Battle Arms Development Investment Cast Enhanced Bolt Catch - .308
    Battle Arms Development Investment Cast Enhanced Bolt Catch - .308
    $15.95
    Out of stock
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  10. Timney Triggers CZ Scorpion Trigger - Curved
    Timney Triggers CZ Scorpion Trigger - Curved
    Special Price $252.99 Regular Price $304.99
    Out of stock
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  11. Rainier Arms UltraMatch MOD 3 AR-15 Billet Ambi Lower Receiver
    Rainier Arms UltraMatch MOD 3 AR-15 Billet Ambi Lower Receiver
    Out of stock
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  12. Aero Precision AR15 Lower Parts Kit Minus FCG, Trigger Guard, and Pistol Grip
    Aero Precision AR15 Lower Parts Kit Minus FCG, Trigger Guard, and Pistol Grip
    $40.00
    Out of stock
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  13. Faxon Firearms Big Gunner .308 WIN, Mid-Length, 4150 QPQ Nitride Barrel - 16"
    Faxon Firearms Big Gunner .308 WIN, Mid-Length, 4150 QPQ Nitride Barrel - 16"
    $219.88
    Out of stock
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  14. Strike Industries Rubber Over-Mold Pistol Grip - 25 Degree Black
    Strike Industries Rubber Over-Mold Pistol Grip - 25 Degree Black
    $22.95
    Out of stock
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  15. Battle Arms Development Workhorse AR-15 Stripped Forged Lower Receiver
    Battle Arms Development Workhorse AR-15 Stripped Forged Lower Receiver
    $125.00
    Out of stock
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  16. Aero Precision AR15 Atlas S-One Handguard 15" - FDE
    Aero Precision AR15 Atlas S-One Handguard 15" - FDE
    $219.99
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Barrel Length
  1. 3.66" 1 item
  2. 5.5" 1 item
  3. 6" 1 item
  4. 6.5" 1 item
  5. 7" 1 item
  6. 8" 2 items
  7. 8.3" 3 items
  8. 8.5" 3 items
  9. 9" 4 items
  10. 10.5" 9 items
  11. 11" 1 item
  12. 11.5" 7 items
  13. 12" 3 items
  14. 12.5" 7 items
  15. 13.7" 4 items
  16. 13.9" 1 item
  17. 14.5" 10 items
  18. 16" 36 items
  19. 16.3" 1 item
  20. 18" 16 items
  21. 20" 13 items
  22. 22" 12 items
Barrel Profile
  1. Dissipator 1 item
  2. Full-fluted 1 item
  3. Non-fluted 2 items
Caliber
  1. .22 ARC 2 items
  2. .223/5.56 4 items
  3. .223 Wylde 8 items
  4. .30-30 1 item
  5. .30 Cal 6 items
  6. .308 5 items
  7. .308 Win 5 items
  8. .338 1 item
  9. .357 Magnum 2 items
  10. .38/.357 Magnum 1 item
  11. .44/.45 2 items
  12. .45-70 GOVT 2 items
  13. .45 ACP 1 item
  14. .458 Socom 2 items
  15. 300 Blackout 15 items
  16. 5.56X45 4 items
  17. 5.56 NATO 53 items
  18. 5.56mm 1 item
  19. 6mm ARC 4 items
  20. 6.5 Creedmoor 6 items
  21. 6.5 Grendel 3 items
  22. 6MM Creedmoor 6 items
  23. 7.62mm 3 items
  24. 7.62x39 1 item
  25. 7.62x51 3 items
  26. 8.6 Blackout 2 items
  27. 9mm 24 items
Category
  1. Receiver Parts 144 items
  2. Parts & Kits 65 items
  3. Barrels 31 items
  4. Rifle Barrels 57 items
  5. Buffer Systems 28 items
  6. Trigger Parts 59 items
  7. Gas Systems 19 items
  8. Muzzle Devices 67 items
  9. Bolt Parts 46 items
  10. Grips 38 items
  11. Charging Handles 25 items
  12. Rifle Handguards 72 items
  13. Stocks & Braces 43 items
  14. MILSPEC Parts 4 items
Co Witness
  1. Lower 1/3 1 item
Color
Configuration
  1. AR-10 1 item
  2. AR-15 10 items
  3. Carbine 1 item
  4. Cross 1 item
  5. Curved 7 items
  6. Flaming Pig 1 item
  7. Flat 9 items
  8. Gen 1-3 1 item
  9. GEN 2 1 item
  10. Ghetto Blaster 1 item
  11. Left Hand 1 item
  12. M-LOK 3 items
  13. M4 Curve 1 item
  14. Rifle 1 item
  15. Straight 1 item
  16. .625 DIA 2 items
  17. .750 DIA 15 items
  18. .936 DIA 1 item
Finish
  1. Bead Blast 1 item
  2. Black 5 items
  3. Black Nitride 4 items
  4. Cerakote 5 items
  5. Chrome 1 item
  6. DLC 4 items
  7. FDE 1 item
  8. Melonite 1 item
  9. NiB-X 1 item
  10. Nickel Boron 4 items
  11. Nitride 17 items
  12. Nitromet 1 item
  13. Phosphate 2 items
  14. Polished 6 items
  15. Satin 13 items
  16. Anodize 22 items
  17. Clear Hard Anodize 3 items
  18. Quench Polish Quench (QPQ) 3 items
  19. Titanium Nitride (TiN) 2 items
Gas Block Diameter
  1. .625" 3 items
  2. .750" 41 items
  3. .875" 7 items
Gas System Length
  1. Blowback 1 item
  2. Pistol 8 items
  3. Carbine 16 items
  4. Mid 33 items
  5. Intermediate 10 items
  6. Rifle 15 items
  7. Rifle +1 2 items
  8. Rifle +2 4 items
Height
  1. Absolute Co-Witness 1 item
Inside Diameter
  1. 1.315" 3 items
  2. 1.34" 2 items
  3. 1.42" 1 item
  4. 1.45" 1 item
  5. 1.5" 1 item
  6. 1.55" 1 item
Manufacturer
  1. A3 Tactical 9 items
  2. Advanced Armament Company (AAC) 1 item
  3. Aero Precision 51 items
  4. Aeroknox 8 items
  5. Agency Arms 1 item
  6. ALG Defense 2 items
  7. Angstadt Arms 10 items
  8. Apex Tactical Specialties 1 item
  9. Armaspec 8 items
  10. Arms Republic 5 items
  11. Ascalon Arms 4 items
  12. Brügger & Thomet (B&T) 1 item
  13. Ballistic Advantage 24 items
  14. Battle Arms Development 35 items
  15. Blackout Defense 8 items
  16. Blitzkrieg Components 2 items
  17. Bootleg 2 items
  18. Bravo Company MFG (BCM) 26 items
  19. Centurion Arms 2 items
  20. Chisel Machining 1 item
  21. Cross Machine Tool (CMT) 8 items
  22. Daniel Defense 2 items
  23. Dead Air Armament 1 item
  24. Dead Foot Arms LLC 3 items
  25. Drew Meyers Defense 4 items
  26. Driven Arms Co. 3 items
  27. Elftmann Tactical 1 item
  28. Emissary Development 2 items
  29. Ergo Grips 7 items
  30. F5 MFG 12 items
  31. Faxon Firearms 35 items
  32. Fortis MFG 9 items
  33. Forward Controls Design 6 items
  34. FosTecH 2 items
  35. Gear Head Works 1 item
  36. Geissele 21 items
  37. Grey Birch MFG 6 items
  38. Grey Ghost Precision 1 item
  39. Griffin Armament 6 items
  40. HB Industries 3 items
  41. HERA ARMS 6 items
  42. Heresy Design 1 item
  43. Hiperfire 13 items
  44. HUXWRX 3 items
  45. Icon Defense 1 item
  46. James Madison Tactical (JMT) 1 item
  47. JK Armament 2 items
  48. JMAC Customs 8 items
  49. JP Enterprises Inc 8 items
  50. Kinetic Development Group 5 items
  51. Knight’s Armament Company (KAC) 14 items
  52. KNS Precision 1 item
  53. Kalashnikov USA 2 items
  54. Krebs Customs 2 items
  55. KynSHOT 2 items
  56. Lantac 13 items
  57. Law Tactical 1 item
  58. Lee Sporting 4 items
  59. Lewis Machine & Tool (LMT) 13 items
  60. Mad Pig 1 item
  61. Magpul Industries 10 items
  62. Matador Arms 1 item
  63. Midwest Industries 23 items
  64. NEMO Arms 4 items
  65. Next Level Armament 1 item
  66. Noveske 26 items
  67. Obsidian Arms 1 item
  68. Patriot Ordnance Factory (POF) 3 items
  69. Precision Armament 5 items
  70. Primary Weapon Systems 7 items
  71. Q, LLC 4 items
  72. R&D Precision 1 item
  73. Radian Weapons 4 items
  74. Rainier Arms, LLC 44 items
  75. Rainier Industries 1 item
  76. SB Tactical 4 items
  77. Sharps Bros 7 items
  78. Sig Sauer 2 items
  79. Silencerco 9 items
  80. Sionics Weapon Systems 5 items
  81. SLR Rifleworks 4 items
  82. Sons of Liberty Gun Works 10 items
  83. Spinta Precision 1 item
  84. Springer Precision 1 item
  85. Stern Defense 3 items
  86. Strike Industries 1 item
  87. Surefire 9 items
  88. Taran Tactical Innovations 1 item
  89. Timney Triggers 2 items
  90. Triggertech 6 items
  91. Troy Industries 7 items
  92. TruCalibre 3 items
  93. Tyrant Designs 4 items
  94. V Seven Weapon Systems 15 items
  95. VLTOR 6 items
  96. WMD Guns 4 items
  97. WOOX 1 item
Model
  1. CZ Bren 1 item
  2. CZ Scorpion 6 items
  3. FNH Scar 1 item
  4. H&K G36 1 item
  5. IWI Galil 1 item
  6. Remington 700 2 items
  7. Sig MCX 4 items
  8. Sig MPX 1 item
Mount
  1. KeyMod 7 items
  2. M-LOK 56 items
  3. Picatinny 23 items
Option
  1. AK-47/74 4 items
  2. AR-9 8 items
  3. AR-10 17 items
  4. AR-15 106 items
  5. Standard 2 items
  6. SRS-C 3.3 oz. 1 item
  7. SRS-H 3.8 oz. 1 item
  8. SRS-H2 4.7 oz. 1 item
  9. SRS-H3 5.6 oz. 1 item
  10. SRS-BB 5.7 oz. 1 item
  11. SRS-9mm 6.4 oz. 1 item
  12. SRS-AR10 5.7 oz. 1 item
  13. Remington 700 Short Action BDL 1 item
  14. Remington 700 Long Action BDL 1 item
  15. Sauer 100 1 item
  16. WA 1 item
  17. KS 1 item
  18. 9mm 1 item
  19. CZ 11 items
  20. FNH 1 item
  21. Glock 3 items
  22. Heckler & Koch 1 item
  23. Remington 1 item
  24. Small Lever 1 item
  25. Large Lever 2 items
  26. AKM 1 item
  27. Adjustable 3 items
  28. Non-Adjustable 14 items
  29. MCS 2 items
  30. Full Size 2 items
Platform
  1. AR-10/LR308 6 items
  2. AR-15 63 items
  3. AK47/74 5 items
  4. CZ-USA 7 items
  5. FNH 1 item
  6. IWI 1 item
  7. Remington 2 items
  8. Remington 700 5 items
  9. Ruger 3 items
  10. Savage Small Shank 5 items
  11. Sig Sauer 6 items
Price
  1. $0.00 - $99.99 236 items
  2. $100.00 - $199.99 172 items
  3. $200.00 - $299.99 126 items
  4. $300.00 - $399.99 47 items
  5. $400.00 - $499.99 60 items
  6. $500.00 - $599.99 19 items
  7. $600.00 - $699.99 10 items
  8. $700.00 - $799.99 20 items
  9. $800.00 - $899.99 5 items
  10. $900.00 and above 3 items
Product Type
  1. 80% Lower 2 items
  2. Accessory 1 item
  3. Angled Grip 4 items
  4. Anti Walk Pins 3 items
  5. AR-10/LR308 Barrel 3 items
  6. AR-10 / LR 308 Charging Handle 3 items
  7. AR-10 Complete Upper Receiver 1 item
  8. AR-10 Partial Upper Receiver 1 item
  9. AR-10 Handguard 5 items
  10. AR-10 Receiver Set 3 items
  11. AR-10 Stripped Lower Receiver 2 items
  12. AR-10 Stripped Upper Receiver 3 items
  13. AR-15 Assembled Upper Receiver 2 items
  14. AR-15 Barrel 18 items
  15. AR-15 Charging Handle 14 items
  16. AR-15 Complete Lower Receiver 22 items
  17. AR-15 Complete Upper Receiver 7 items
  18. AR-15 Partial Upper Receiver 20 items
  19. AR-15 Handguard 26 items
  20. AR-15 Receiver Set 8 items
  21. AR-15 Stripped Lower Receiver 22 items
  22. AR-15 Stripped Upper Receiver 19 items
  23. AR-9 Lower Receiver 4 items
  24. AR-9 Complete Lower Receiver 1 item
  25. AR-9 Receiver Set 1 item
  26. AR-9 Upper Receiver 6 items
  27. Barrel 56 items
  28. Blast Shield 2 items
  29. Bolt 6 items
  30. Bolt-Action Barrel 10 items
  31. Bolt Carrier Group 36 items
  32. Bolt Catch 6 items
  33. Brace 7 items
  34. Buffer 9 items
  35. Buffer Kit 5 items
  36. Buffer Spring 1 item
  37. Buffer Tube 10 items
  38. Builders Kit 1 item
  39. Cam Pin 1 item
  40. Charging Handle 5 items
  41. Chassis 7 items
  42. Compensator 6 items
  43. Complete Upper 6 items
  44. Dust Cover 1 item
  45. End Cap 1 item
  46. End Plate 2 items
  47. Firing Pin 2 items
  48. Flash Hider 18 items
  49. Forearm Accesory 4 items
  50. Forward Assist 1 item
  51. Gas Block 15 items
  52. Gas Tube 2 items
  53. Grip Module 1 item
  54. Gunsmithing Tool 1 item
  55. Handguard 27 items
  56. Handgun 1 item
  57. Handstop 15 items
  58. Iron Sight 1 item
  59. Lower Parts Kit 9 items
  60. Lower Receiver 4 items
  61. Magazine Catch 2 items
  62. Magazine Release 6 items
  63. Magwell 1 item
  64. Muzzle Brake 35 items
  65. Muzzle Device Accessory 6 items
  66. Parts Kit 1 item
  67. Patch 1 item
  68. Pistol Grip 11 items
  69. Piston System 1 item
  70. Port Door 1 item
  71. Port Door Rod 1 item
  72. Rail Adapter 2 items
  73. Rail Panel 3 items
  74. Rail Section 2 items
  75. Recoil Spring 1 item
  76. Retainer Pin 2 items
  77. Safety Selector 15 items
  78. Scope Mount 1 item
  79. Shim Set 1 item
  80. Silent Captured Spring 1 item
  81. Sling Mount 2 items
  82. Stock 25 items
  83. Stock Accessory 3 items
  84. Stock Adapter 6 items
  85. Take Down / Pivot Pins 6 items
  86. Trigger 50 items
  87. Trigger Guard 3 items
  88. Trigger Spring 1 item
  89. Upper Parts Kit 1 item
  90. Vertical Grip 7 items
  91. Weight 1 item
Rail Length
  1. 3" 1 item
  2. 4" 1 item
  3. 5" 2 items
  4. 5.5" 1 item
  5. 6.0" 2 items
  6. 6.25" 1 item
  7. 6.7" 4 items
  8. 7" 3 items
  9. 7.25" 2 items
  10. 8" 2 items
  11. 8.25" 1 item
  12. 9" 3 items
  13. 9.5" 4 items
  14. 9.55" 1 item
  15. 9.6" 3 items
  16. 10" 13 items
  17. 10.5" 5 items
  18. 10.7" 1 item
  19. 10.75" 1 item
  20. 11.5" 3 items
  21. 12" 12 items
  22. 12.25" 1 item
  23. 12.4" 2 items
  24. 12.5" 2 items
  25. 12.625" 1 item
  26. 13" 8 items
  27. 13.5" 3 items
  28. 13.6" 4 items
  29. 13.625" 2 items
  30. 13.7" 4 items
  31. 13.8" 2 items
  32. 14" 2 items
  33. 15" 23 items
  34. 15.3" 2 items
  35. 16" 1 item
  36. 16.5" 1 item
  37. 17" 1 item
  38. 18" 1 item
Size
  1. 35mm rings 2 items
  2. BACK STRAP:Large 1 item
  3. BACK STRAP:Medium 2 items
  4. 3 Slot 2 items
  5. 5 Slot 2 items
  6. 7 Slot 2 items
  7. 9 Slot 12 items
Thread Pitch
  1. 1.125x28 1 item
  2. 1.375-24 1 item
  3. 1/2x28 68 items
  4. 1/2x36 1 item
  5. 5/8x24 39 items
  6. 5/8x32 1 item
  7. 11/16x24 1 item
  8. M14x1 LH 1 item
  9. M24x1.5 RH 2 items
Threaded
  1. Yes 26 items
Twist Rate
  1. 1:3 1 item
  2. 1:7 29 items
  3. 1:7.5 10 items
  4. 1:8 11 items
  5. 1:10 10 items
Stock Status
  1. Out of stock 698 items Remove This Item
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