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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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Items 1-16 of 728

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  1. Ballistic Advantage Modern Series 5.56 SPR Barrel - 18"
    Ballistic Advantage Modern Series 5.56 SPR Barrel - 18"
    $175.75
    Out of stock
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  2. Midwest Industries Enhanced AR-15 Single Stage Trigger w/ Anti-Walk Pins - 3.5lbs
    Midwest Industries Enhanced AR-15 Single Stage Trigger w/ Anti-Walk Pins - 3.5lbs
    $167.95
    Out of stock
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  3. Aero Precision AR15 Enhanced Carbine Buffer Tube Kit - H2
    Aero Precision AR15 Enhanced Carbine Buffer Tube Kit - H2
    $104.99
    Out of stock
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  4. Ballistic Advantage Modern Series 5.56 Government Profile Midlength AR 15 Barrel - 14.5"
    Ballistic Advantage Modern Series 5.56 Government Profile Midlength AR 15 Barrel - 14.5"
    $161.50
    Out of stock
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  5. Ballistic Advantage Modern Series 300BLK Barrel - 10.5"
    Ballistic Advantage Modern Series 300BLK Barrel - 10.5"
    $156.75
    Out of stock
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  6. Ballistic Advantage Modern Series 5.56 Government Barrel - 12.5"
    Ballistic Advantage Modern Series 5.56 Government Barrel - 12.5"
    $152.00
    Out of stock
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  7. Fortis MFG AR-15 REV 2.0 Free Float Rail System - FDE
    Fortis MFG AR-15 REV 2.0 Free Float Rail System - FDE
    Out of stock
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  8. Fortis MFG AR-15 REV 2.0 Free Float Rail System - OD Green
    Fortis MFG AR-15 REV 2.0 Free Float Rail System - OD Green
    Out of stock
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  9. Arms Republic CZ Scorpion Picatinny Stock/Brace Adaptor
    Arms Republic CZ Scorpion Picatinny Stock/Brace Adaptor
    $39.95
    Out of stock
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  10. Aeroknox AX // Foregrip - M-LOK
    Aeroknox AX // Foregrip - M-LOK
    $50.00
    Out of stock
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  11. Ballistic Advantage Lo-Pro Gas Block - .750"
    Ballistic Advantage Lo-Pro Gas Block - .750"
    $28.50
    Out of stock
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  12. Patriot Ordnance Factory (POF) P15 Gen 4 .223 Complete Lower Receiver
    Patriot Ordnance Factory (POF) P15 Gen 4 .223 Complete Lower Receiver
    $633.00
    Out of stock
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  13. Midwest Industries Picatinny Side Folding Arm - Pistol Brace Compatible
    Midwest Industries Picatinny Side Folding Arm - Pistol Brace Compatible
    $146.95
    Out of stock
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  14. Maxim Defense MDX 510 300 Blk Mil-Spec Complete Upper - 10.3" Arid
    Maxim Defense MDX 510 300 Blk Mil-Spec Complete Upper - 10.3" Arid
    $1,255.50
    Out of stock
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  15. Bravo Company MFG (BCM) .300 Blackout Partial Upper Receiver w/ MCMR-5 - 7"
    Bravo Company MFG (BCM) .300 Blackout Partial Upper Receiver w/ MCMR-5 - 7"
    $719.00
    Out of stock
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  16. Ballistic Advantage .308 Bolt Carrier Group - Black Nitride
    Ballistic Advantage .308 Bolt Carrier Group - Black Nitride
    $204.25
    Out of stock
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Items 1-16 of 728

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Shopping Options
Barrel Length
  1. 3.66" 1 item
  2. 4" 1 item
  3. 5.5" 6 items
  4. 6" 1 item
  5. 6.5" 1 item
  6. 7" 1 item
  7. 7.94" 1 item
  8. 8" 4 items
  9. 8.3" 3 items
  10. 8.5" 7 items
  11. 9" 4 items
  12. 9.5" 1 item
  13. 9.75" 1 item
  14. 10.3" 4 items
  15. 10.5" 8 items
  16. 11" 1 item
  17. 11.5" 8 items
  18. 12" 3 items
  19. 12.5" 5 items
  20. 13.7" 3 items
  21. 13.9" 1 item
  22. 14.5" 9 items
  23. 16" 34 items
  24. 16.1" 1 item
  25. 16.3" 1 item
  26. 18" 17 items
  27. 20" 12 items
  28. 22" 12 items
Barrel Profile
  1. Full-fluted 2 items
  2. Non-fluted 3 items
Caliber
  1. .22 ARC 2 items
  2. .22 LR 1 item
  3. .223/5.56 6 items
  4. .223 Wylde 6 items
  5. .30-30 1 item
  6. .30 Cal 5 items
  7. .308 4 items
  8. .308 Win 5 items
  9. .338 1 item
  10. .357 Magnum 2 items
  11. .38/.357 Magnum 1 item
  12. .44/.45 2 items
  13. .45-70 GOVT 2 items
  14. .45 ACP 1 item
  15. .458 Socom 2 items
  16. 300 Blackout 22 items
  17. 5.56X45 4 items
  18. 5.56 NATO 58 items
  19. 5.56mm 2 items
  20. 6mm ARC 5 items
  21. 6.5 Creedmoor 6 items
  22. 6.5 Grendel 3 items
  23. 6MM Creedmoor 6 items
  24. 7.62mm 4 items
  25. 7.62x39 3 items
  26. 7.62x51 3 items
  27. 8.6 Blackout 2 items
  28. 9mm 27 items
Category
  1. Receiver Parts 165 items
  2. Parts & Kits 69 items
  3. Barrels 17 items
  4. Rifle Barrels 66 items
  5. Buffer Systems 24 items
  6. Trigger Parts 61 items
  7. Gas Systems 19 items
  8. Muzzle Devices 70 items
  9. Bolt Parts 45 items
  10. Grips 40 items
  11. Charging Handles 23 items
  12. Rifle Handguards 79 items
  13. Stocks & Braces 44 items
  14. MILSPEC Parts 4 items
Co Witness
  1. Lower 1/3 1 item
Color
Configuration
  1. AR-10 1 item
  2. AR-15 11 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. Mil-Spec 1 item
  15. Rifle 1 item
  16. Straight 1 item
  17. .625 DIA 2 items
  18. .750 DIA 16 items
  19. .936 DIA 1 item
  20. Standard Buffer and Spring 1 item
Finish
  1. Arid 2 items
  2. Bead Blast 1 item
  3. Black 5 items
  4. Black Nitride 3 items
  5. Cerakote 5 items
  6. Chrome 1 item
  7. DLC 4 items
  8. FDE 1 item
  9. Melonite 1 item
  10. NiB-X 1 item
  11. Nickel Boron 6 items
  12. Nitride 15 items
  13. Nitromet 1 item
  14. Phosphate 2 items
  15. Polished 5 items
  16. Satin 9 items
  17. Anodize 28 items
  18. Clear Hard Anodize 4 items
  19. Quench Polish Quench (QPQ) 3 items
  20. Titanium Nitride (TiN) 2 items
Gas Block Diameter
  1. .625" 3 items
  2. .750" 41 items
  3. .875" 7 items
Gas Length
  1. Pistol 11 items
  2. Carbine 14 items
  3. Mid 35 items
  4. Intermediate 9 items
  5. Rifle 12 items
  6. Rifle +1 2 items
  7. 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
Is Firearms?
  1. No 728 items
Manufacturer
  1. A3 Tactical 13 items
  2. Advanced Armament Company (AAC) 1 item
  3. Aero Precision 49 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. B5 Systems 1 item
  14. Ballistic Advantage 24 items
  15. Battle Arms Development 35 items
  16. Blackout Defense 8 items
  17. Blitzkrieg Components 6 items
  18. Bootleg 2 items
  19. Bravo Company MFG (BCM) 27 items
  20. Centurion Arms 11 items
  21. Chisel Machining 1 item
  22. Cross Machine Tool (CMT) 8 items
  23. Daniel Defense 5 items
  24. Dead Air Armament 1 item
  25. Dead Foot Arms LLC 3 items
  26. Drew Meyers Defense 4 items
  27. Driven Arms Co. 2 items
  28. Elftmann Tactical 1 item
  29. Emissary Development 1 item
  30. Ergo Grips 7 items
  31. F5 MFG 12 items
  32. Faxon Firearms 36 items
  33. Fortis MFG 11 items
  34. Forward Controls Design 6 items
  35. FosTecH 2 items
  36. Gear Head Works 1 item
  37. Geissele 20 items
  38. Grey Birch MFG 7 items
  39. Grey Ghost Precision 1 item
  40. Griffin Armament 5 items
  41. HB Industries 3 items
  42. HERA ARMS 7 items
  43. Heresy Design 1 item
  44. Hiperfire 15 items
  45. HUXWRX 5 items
  46. Icon Defense 1 item
  47. James Madison Tactical (JMT) 1 item
  48. JK Armament 1 item
  49. JMAC Customs 7 items
  50. JP Enterprises Inc 7 items
  51. Kinetic Development Group 5 items
  52. Knight’s Armament Company (KAC) 14 items
  53. KNS Precision 4 items
  54. Kalashnikov USA 2 items
  55. Krebs Customs 2 items
  56. KynSHOT 2 items
  57. Lantac 16 items
  58. Law Tactical 1 item
  59. Lee Sporting 4 items
  60. Lewis Machine & Tool (LMT) 8 items
  61. Mad Pig 1 item
  62. Magpul Industries 10 items
  63. Matador Arms 1 item
  64. Maxim Defense 7 items
  65. Midwest Industries 23 items
  66. NEMO Arms 4 items
  67. Next Level Armament 5 items
  68. Noveske 28 items
  69. Obsidian Arms 1 item
  70. Patriot Ordnance Factory (POF) 3 items
  71. Precision Armament 5 items
  72. Primary Weapon Systems 9 items
  73. Q, LLC 4 items
  74. R&D Precision 1 item
  75. Radian Weapons 2 items
  76. Rainier Arms, LLC 40 items
  77. Rise Armament 1 item
  78. SB Tactical 3 items
  79. Sharps Bros 6 items
  80. Sig Sauer 4 items
  81. Silencerco 9 items
  82. Sionics Weapon Systems 5 items
  83. SLR Rifleworks 4 items
  84. Sons of Liberty Gun Works 8 items
  85. Spinta Precision 4 items
  86. Springer Precision 1 item
  87. Stern Defense 6 items
  88. Strike Industries 1 item
  89. Surefire 8 items
  90. Taran Tactical Innovations 1 item
  91. Timney Triggers 1 item
  92. Triggertech 6 items
  93. Troy Industries 7 items
  94. TruCalibre 3 items
  95. Tyrant Designs 4 items
  96. V Seven Weapon Systems 12 items
  97. VLTOR 5 items
  98. WMD Guns 4 items
  99. WOOX 1 item
Model
  1. CZ Scorpion 6 items
  2. FNH Scar 1 item
  3. IWI Galil 1 item
  4. Remington 700 1 item
  5. Sig MCX 6 items
  6. Sig MPX 1 item
Mount
  1. KeyMod 7 items
  2. M-LOK 62 items
  3. Picatinny 25 items
Optic Footprint
  1. Aimpoint Acro 1 item
Option
  1. AK-47/74 5 items
  2. AR-9 8 items
  3. AR-10 16 items
  4. AR-15 116 items
  5. Standard 3 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. Small Lever 1 item
  24. Large Lever 2 items
  25. AKM 1 item
  26. Adjustable 3 items
  27. Non-Adjustable 14 items
  28. MCS 2 items
  29. Full Size 2 items
  30. Dimpled 1 item
Platform
  1. AR-10 3 items
  2. AR-15 52 items
  3. AK47/74 5 items
  4. CZ-USA 7 items
  5. FNH 1 item
  6. IWI 1 item
  7. Remington 1 item
  8. Remington 700 5 items
  9. Ruger 4 items
  10. Savage Small Shank 5 items
  11. Sig Sauer 8 items
Price
  1. $0.00 - $999.99 703 items
  2. $1,000.00 - $1,999.99 24 items
  3. $2,000.00 and above 1 item
Product Type
  1. 80% Lower 2 items
  2. Accessory 2 items
  3. Angled Grip 6 items
  4. Anti Walk Pins 3 items
  5. AR-10 Barrel 1 item
  6. AR-10 / LR 308 Charging Handle 3 items
  7. AR-10 Partial Upper Receiver 2 items
  8. AR-10 Handguard 5 items
  9. AR-10 Receiver Set 3 items
  10. AR-10 Stripped Lower Receiver 2 items
  11. AR-10 Stripped Upper Receiver 3 items
  12. AR-15 Assembled Upper Receiver 2 items
  13. AR-15 Barrel 4 items
  14. AR-15 Charging Handle 11 items
  15. AR-15 Complete Lower Receiver 22 items
  16. AR-15 Complete Upper Receiver 24 items
  17. AR-15 Partial Upper Receiver 19 items
  18. AR-15 Handguard 32 items
  19. AR-15 Receiver Set 7 items
  20. AR-15 Stripped Lower Receiver 22 items
  21. AR-15 Stripped Upper Receiver 19 items
  22. AR-9 Lower Receiver 4 items
  23. AR-9 Complete Lower Receiver 1 item
  24. AR-9 Receiver Set 1 item
  25. AR-9 Upper Receiver 7 items
  26. Barrel 65 items
  27. Blast Shield 2 items
  28. Bolt 6 items
  29. Bolt-Action Barrel 10 items
  30. Bolt Carrier Group 35 items
  31. Bolt Catch 6 items
  32. Brace 7 items
  33. Buffer 10 items
  34. Buffer Kit 5 items
  35. Buffer Spring 1 item
  36. Buffer Tube 7 items
  37. Builders Kit 1 item
  38. Cam Pin 1 item
  39. Charging Handle 6 items
  40. Chassis 9 items
  41. Compensator 7 items
  42. Complete Upper 9 items
  43. Dust Cover 1 item
  44. End Plate 3 items
  45. Firing Pin 2 items
  46. Flash Hider 17 items
  47. Forearm Accesory 4 items
  48. Forward Assist 1 item
  49. Gas Block 15 items
  50. Gas Tube 2 items
  51. Grip Accessory 1 item
  52. Grip Module 1 item
  53. Gunsmithing Tool 1 item
  54. Handguard 28 items
  55. Handgun 1 item
  56. Handstop 14 items
  57. Iron Sight 1 item
  58. Lower Parts Kit 9 items
  59. Lower Receiver 4 items
  60. Magazine Catch 2 items
  61. Magazine Release 5 items
  62. Magwell 1 item
  63. Muzzle Brake 38 items
  64. Muzzle Device Accessory 6 items
  65. Parts Kit 1 item
  66. Patch 1 item
  67. Pistol Grip 12 items
  68. Piston System 1 item
  69. Port Door 1 item
  70. Rail Adapter 2 items
  71. Rail Panel 2 items
  72. Rail Section 2 items
  73. Recoil Spring 1 item
  74. Retainer Pin 1 item
  75. Safety Selector 17 items
  76. Scope Mount 1 item
  77. Shim Set 2 items
  78. Sight Post 4 items
  79. Sling Mount 2 items
  80. Stock 25 items
  81. Stock Accessory 4 items
  82. Stock Adapter 6 items
  83. Take Down / Pivot Pins 7 items
  84. Trigger 52 items
  85. Trigger Guard 3 items
  86. Trigger Spring 1 item
  87. Upper Parts Kit 1 item
  88. Vertical Grip 6 items
  89. 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. 6.91" 1 item
  9. 7" 5 items
  10. 7.25" 2 items
  11. 8" 2 items
  12. 8.25" 1 item
  13. 9" 3 items
  14. 9.5" 6 items
  15. 9.55" 1 item
  16. 9.6" 3 items
  17. 10" 15 items
  18. 10.5" 6 items
  19. 10.7" 1 item
  20. 10.75" 1 item
  21. 11.5" 2 items
  22. 12" 14 items
  23. 12.25" 1 item
  24. 12.4" 2 items
  25. 12.5" 3 items
  26. 12.625" 1 item
  27. 13" 8 items
  28. 13.5" 2 items
  29. 13.6" 4 items
  30. 13.625" 2 items
  31. 13.7" 4 items
  32. 13.8" 2 items
  33. 14" 1 item
  34. 15" 27 items
  35. 15.3" 3 items
  36. 16" 1 item
  37. 16.5" 1 item
  38. 17" 1 item
  39. 18" 1 item
Size
  1. 35mm rings 3 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 73 items
  4. 1/2x36 1 item
  5. 5/8x24 45 items
  6. 5/8x32 1 item
  7. 11/16x24 1 item
  8. M24x1.5 RH 2 items
Threaded
  1. Yes 29 items
Twist Rate
  1. 1:3 1 item
  2. 1:7 32 items
  3. 1:7.5 7 items
  4. 1:8 8 items
  5. 1:10 10 items
Stock Status
  1. In stock 2 items
  2. Out of stock 726 items Remove This Item
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