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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. Angstadt Arms AR-15 5.56 Complete Upper Assembly - 16"
    Angstadt Arms AR-15 5.56 Complete Upper Assembly - 16"
    $404.00
    Out of stock
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  2. Armaspec Gen 4 Stealth Recoil Spring
    Armaspec Gen 4 Stealth Recoil Spring
    Out of stock
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  3. Aero Precision AR-15 Gen 2 Carbine Complete Lower w/ A2 Grip, No Stock - FDE Cerakote
    Aero Precision AR-15 Gen 2 Carbine Complete Lower w/ A2 Grip, No Stock - FDE Cerakote
    $294.99
    Out of stock
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  4. Apex Tactical Specialties Optimized Grip for CZ Scorpion Evo 3 S1
    Apex Tactical Specialties Optimized Grip for CZ Scorpion Evo 3 S1
    $28.50
    Out of stock
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  5. Angstadt Arms AR-15 0940 Lower Receiver for Glock
    Angstadt Arms AR-15 0940 Lower Receiver for Glock
    $250.00
    Out of stock
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  6. Bravo Company MFG (BCM) AR-15 Upper Receiver BFH(.2.23/5.56) 11.5
    Bravo Company MFG (BCM) AR-15 Upper Receiver BFH(.2.23/5.56) 11.5
    $594.00
    Out of stock
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  7. Bravo Company MFG (BCM) Lower Group w/ Mod 0 Stock Black
    Bravo Company MFG (BCM) Lower Group w/ Mod 0 Stock Black
    $395.00
    Out of stock
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  8. JP Enterprises Enhanced Bolt - 6.5 Grendel
    JP Enterprises Enhanced Bolt - 6.5 Grendel
    $142.45
    Out of stock
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  9. 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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  10. Bravo Company MFG (BCM) AR-15 BFH Upper Receiver Group - 16"
    Bravo Company MFG (BCM) AR-15 BFH Upper Receiver Group - 16"
    $594.00
    Out of stock
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  11. Bravo Company MFG (BCM) GUNFIGHTER Ambidextrous Charging Handle 556 Mod 3X3 (Large Latch)
    Bravo Company MFG (BCM) GUNFIGHTER Ambidextrous Charging Handle 556 Mod 3X3 (Large Latch)
    $89.95
    Out of stock
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  12. Bravo Company MFG (BCM) AR-15 BFH 11.5" Carbine Length Upper Receiver Group w/ BCM MCMR-10 Handguard
    Bravo Company MFG (BCM) AR-15 BFH 11.5" Carbine Length Upper Receiver Group w/ BCM MCMR-10 Handguard
    $758.95
    Out of stock
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  13. Bravo Company MFG (BCM) AR-15 Upper Receiver 9" 300 BLACKOUT MCMR-8
    Bravo Company MFG (BCM) AR-15 Upper Receiver 9" 300 BLACKOUT MCMR-8
    $731.45
    Out of stock
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  14. Bravo Company MFG (BCM) Lower Group No Stock AR15
    Bravo Company MFG (BCM) Lower Group No Stock AR15
    $349.99
    Out of stock
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  15. JP Enterprises Enhanced Bolt - .223
    JP Enterprises Enhanced Bolt - .223
    $125.35
    Out of stock
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  16. Brügger & Thomet (B&T) APC9 / APC45 Tailhook Adaptor
    Brügger & Thomet (B&T) APC9 / APC45 Tailhook Adaptor
    $89.00
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Items 113-128 of 717

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Barrel Length
  1. 5.5" 6 items
  2. 6" 1 item
  3. 6.5" 1 item
  4. 7" 1 item
  5. 7.94" 1 item
  6. 8" 2 items
  7. 8.3" 3 items
  8. 8.5" 5 items
  9. 9" 4 items
  10. 9.5" 1 item
  11. 9.75" 1 item
  12. 10.3" 2 items
  13. 10.5" 9 items
  14. 11" 1 item
  15. 11.5" 9 items
  16. 12" 3 items
  17. 12.5" 8 items
  18. 13.7" 4 items
  19. 13.9" 1 item
  20. 14.5" 12 items
  21. 16" 42 items
  22. 16.1" 1 item
  23. 16.3" 1 item
  24. 18" 18 items
  25. 20" 13 items
  26. 22" 12 items
Barrel Profile
  1. Dissipator 1 item
  2. Full-fluted 1 item
  3. Non-fluted 3 items
Caliber
  1. .22 ARC 2 items
  2. .223/5.56 5 items
  3. .223 Wylde 9 items
  4. .30-30 1 item
  5. .30 Cal 6 items
  6. .308 7 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 21 items
  16. 5.56X45 5 items
  17. 5.56 NATO 64 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 2 items
  24. 7.62x39 3 items
  25. 7.62x51 3 items
  26. 8.6 Blackout 3 items
  27. 9mm 25 items
Category
  1. Receiver Parts 159 items
  2. Parts & Kits 72 items
  3. Barrels 33 items
  4. Rifle Barrels 58 items
  5. Buffer Systems 25 items
  6. Trigger Parts 55 items
  7. Gas Systems 19 items
  8. Muzzle Devices 65 items
  9. Bolt Parts 46 items
  10. Grips 32 items
  11. Charging Handles 28 items
  12. Rifle Handguards 78 items
  13. Stocks & Braces 44 items
  14. MILSPEC Parts 3 items
Co Witness
  1. Lower 1/3 1 item
Color
Configuration
  1. AR-10 1 item
  2. AR-15 12 items
  3. Carbine 1 item
  4. Cross 1 item
  5. Curved 8 items
  6. Flaming Pig 1 item
  7. Flat 8 items
  8. Ghetto Blaster 1 item
  9. Left 1 item
  10. Left Hand 1 item
  11. M-LOK 3 items
  12. Straight 1 item
  13. .625 DIA 2 items
  14. .750 DIA 15 items
  15. .936 DIA 1 item
Finish
  1. Arid 1 item
  2. Bead Blast 1 item
  3. Black 5 items
  4. Black Nitride 4 items
  5. Cerakote 5 items
  6. Chrome 1 item
  7. DLC 3 items
  8. FDE 1 item
  9. Melonite 1 item
  10. NiB-X 1 item
  11. Nickel Boron 4 items
  12. Nitride 18 items
  13. Nitromet 1 item
  14. Phosphate 2 items
  15. Polished 6 items
  16. Satin 13 items
  17. Anodize 23 items
  18. Quench Polish Quench (QPQ) 5 items
  19. Titanium Nitride (TiN) 2 items
Gas Block Diameter
  1. .625" 3 items
  2. .750" 49 items
  3. .875" 7 items
Gas System Length
  1. Blowback 1 item
  2. Pistol 11 items
  3. Carbine 18 items
  4. Mid 40 items
  5. Intermediate 10 items
  6. Rifle 15 items
  7. Rifle +1 2 items
  8. Rifle +2 4 items
Height
  1. Absolute Co-Witness 2 items
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 8 items
  2. Advanced Armament Company (AAC) 1 item
  3. Aero Precision 52 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) 2 items
  13. B5 Systems 1 item
  14. Ballistic Advantage 25 items
  15. Battle Arms Development 36 items
  16. Blackout Defense 8 items
  17. Blitzkrieg Components 2 items
  18. Bootleg 2 items
  19. Bravo Company MFG (BCM) 27 items
  20. Centurion Arms 3 items
  21. Chisel Machining 1 item
  22. Cross Machine Tool (CMT) 8 items
  23. Daniel Defense 6 items
  24. Dead Air Armament 1 item
  25. Dead Foot Arms LLC 3 items
  26. Drew Meyers Defense 4 items
  27. Driven Arms Co. 1 item
  28. Elftmann Tactical 1 item
  29. Emissary Development 2 items
  30. Ergo Grips 7 items
  31. F5 MFG 12 items
  32. Faxon Firearms 35 items
  33. Fortis MFG 9 items
  34. Forward Controls Design 5 items
  35. FosTecH 2 items
  36. Gear Head Works 2 items
  37. Geissele 15 items
  38. Grand Power 1 item
  39. Grey Ghost Precision 1 item
  40. Griffin Armament 6 items
  41. HB Industries 4 items
  42. HERA ARMS 3 items
  43. Heresy Design 1 item
  44. Hiperfire 14 items
  45. HUXWRX 3 items
  46. Icon Defense 1 item
  47. James Madison Tactical (JMT) 1 item
  48. JK Armament 1 item
  49. JMAC Customs 8 items
  50. JP Enterprises Inc 8 items
  51. Kinetic Development Group 5 items
  52. Knight’s Armament Company (KAC) 13 items
  53. KNS Precision 1 item
  54. Kalashnikov USA 2 items
  55. Krebs Customs 2 items
  56. KynSHOT 3 items
  57. Lantac 14 items
  58. Lewis Machine & Tool (LMT) 15 items
  59. Mad Pig 1 item
  60. Magpul Industries 10 items
  61. Matador Arms 1 item
  62. Maxim Defense 6 items
  63. Midwest Industries 23 items
  64. NEMO Arms 4 items
  65. Next Level Armament 1 item
  66. Noveske 32 items
  67. Obsidian Arms 1 item
  68. Precision Armament 2 items
  69. Primary Weapon Systems 9 items
  70. Q, LLC 4 items
  71. R&D Precision 1 item
  72. Radian Weapons 4 items
  73. Rainier Arms, LLC 47 items
  74. Rainier Industries 3 items
  75. RS Regulate 1 item
  76. SB Tactical 4 items
  77. Sharps Bros 6 items
  78. Sig Sauer 5 items
  79. Silencerco 9 items
  80. Sionics Weapon Systems 5 items
  81. SLR Rifleworks 4 items
  82. Sons of Liberty Gun Works 11 items
  83. Spinta Precision 1 item
  84. Sprinco (Tactical Springs) 2 items
  85. Springer Precision 1 item
  86. Stern Defense 3 items
  87. Strike Industries 1 item
  88. Surefire 10 items
  89. Taran Tactical Innovations 1 item
  90. Timney Triggers 4 items
  91. Triggertech 6 items
  92. Troy Industries 7 items
  93. TruCalibre 3 items
  94. Tyrant Designs 4 items
  95. V Seven Weapon Systems 18 items
  96. VLTOR 6 items
  97. WMD Guns 5 items
  98. WOOX 1 item
Model
  1. CZ Bren 2 items
  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 5 items
  8. Sig MPX 1 item
Mount
  1. KeyMod 7 items
  2. M-LOK 65 items
  3. Picatinny 24 items
Optic Footprint
  1. Aimpoint Acro 1 item
Option
  1. AK-47/74 4 items
  2. AR-9 8 items
  3. AR-10 18 items
  4. AR-15 110 items
  5. Standard 2 items
  6. Orange - Extra Extra Power 1 item
  7. SRS-C 3.3 oz. 1 item
  8. SRS-H 3.8 oz. 1 item
  9. SRS-H2 4.7 oz. 1 item
  10. SRS-H3 5.6 oz. 1 item
  11. SRS-BB 5.7 oz. 1 item
  12. SRS-9mm 6.4 oz. 1 item
  13. SRS-AR10 5.7 oz. 1 item
  14. Remington 700 Short Action BDL 1 item
  15. Remington 700 Long Action BDL 1 item
  16. Sauer 100 1 item
  17. WA 1 item
  18. KS 1 item
  19. 9mm 1 item
  20. CZ 11 items
  21. FNH 1 item
  22. Glock 3 items
  23. Heckler & Koch 1 item
  24. Sharps Bros 1 item
  25. Small Lever 1 item
  26. Large Lever 2 items
  27. AKM 1 item
  28. Adjustable 3 items
  29. Non-Adjustable 14 items
  30. MCS 2 items
  31. Full Size 2 items
Platform
  1. AR-9 1 item
  2. AR-10/LR308 7 items
  3. AR-15 66 items
  4. AK47/74 5 items
  5. CZ-USA 6 items
  6. FNH 1 item
  7. IWI 1 item
  8. Remington 2 items
  9. Remington 700 6 items
  10. Savage Small Shank 5 items
  11. Sig Sauer 7 items
Price
  1. $0.00 - $999.99 692 items
  2. $1,000.00 - $1,999.99 23 items
  3. $2,000.00 and above 2 items
Product Type
  1. 80% Lower 2 items
  2. Accessory 1 item
  3. Angled Grip 3 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 3 items
  9. AR-10 Handguard 6 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 19 items
  15. AR-15 Charging Handle 15 items
  16. AR-15 Complete Lower Receiver 20 items
  17. AR-15 Complete Upper Receiver 24 items
  18. AR-15 Partial Upper Receiver 21 items
  19. AR-15 Handguard 28 items
  20. AR-15 Receiver Set 8 items
  21. AR-15 Stripped Lower Receiver 24 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 57 items
  28. Blast Shield 2 items
  29. Bolt 5 items
  30. Bolt-Action Barrel 11 items
  31. Bolt Carrier Group 36 items
  32. Bolt Catch 5 items
  33. Brace 9 items
  34. Buffer 9 items
  35. Buffer Kit 6 items
  36. Buffer Spring 1 item
  37. Buffer Tube 8 items
  38. Builders Kit 1 item
  39. Cam Pin 1 item
  40. Castle Nut / End Plate 1 item
  41. Charging Handle 7 items
  42. Chassis 2 items
  43. Compensator 5 items
  44. Complete Upper 10 items
  45. Dust Cover 2 items
  46. End Cap 2 items
  47. Firing Pin 3 items
  48. Flash Hider 18 items
  49. Forearm Accesory 5 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 30 items
  56. Handgun 1 item
  57. Handstop 12 items
  58. Iron Sight 1 item
  59. Lower Parts Kit 9 items
  60. Magazine Catch 2 items
  61. Magazine Release 6 items
  62. Magwell 2 items
  63. Muzzle Brake 33 items
  64. Muzzle Device Accessory 7 items
  65. Parts Kit 2 items
  66. Patch 1 item
  67. Pistol Grip 10 items
  68. Piston System 1 item
  69. Port Door 1 item
  70. Port Door Rod 3 items
  71. Rail Adapter 2 items
  72. Rail Panel 3 items
  73. Rail Section 2 items
  74. Recoil Spring 1 item
  75. Safety Selector 15 items
  76. Scope Mount 1 item
  77. Shim Set 1 item
  78. Silent Captured Spring 1 item
  79. Sling Mount 2 items
  80. Spring 1 item
  81. Stock 25 items
  82. Stock Accessory 3 items
  83. Stock Adapter 6 items
  84. Take Down / Pivot Pins 7 items
  85. Trigger 46 items
  86. Trigger / Hammer Pins 1 item
  87. Trigger Guard 3 items
  88. Trigger Spring 1 item
  89. Upper Parts Kit 1 item
  90. Vertical Grip 6 items
  91. Weight 1 item
Rail Length
  1. 3" 1 item
  2. 4" 1 item
  3. 5" 1 item
  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" 6 items
  10. 7.25" 2 items
  11. 8" 2 items
  12. 8.25" 1 item
  13. 9" 5 items
  14. 9.5" 5 items
  15. 9.55" 1 item
  16. 9.6" 3 items
  17. 10" 9 items
  18. 10.5" 6 items
  19. 10.7" 1 item
  20. 10.75" 1 item
  21. 11" 1 item
  22. 11.5" 3 items
  23. 12" 12 items
  24. 12.25" 1 item
  25. 12.4" 2 items
  26. 12.5" 4 items
  27. 12.625" 1 item
  28. 12.75" 1 item
  29. 13" 8 items
  30. 13.5" 4 items
  31. 13.6" 4 items
  32. 13.625" 2 items
  33. 13.7" 4 items
  34. 13.8" 2 items
  35. 14" 1 item
  36. 15" 29 items
  37. 15.3" 3 items
  38. 16" 1 item
  39. 16.5" 1 item
  40. 17" 1 item
  41. 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 74 items
  4. 1/2x36 1 item
  5. 5/8x24 42 items
  6. 5/8x32 1 item
  7. 11/16x24 1 item
  8. M24x1.5 RH 2 items
Threaded
  1. Yes 27 items
Twist Rate
  1. 1:3 2 items
  2. 1:7 38 items
  3. 1:7.5 10 items
  4. 1:8 12 items
  5. 1:10 11 items
Stock Status
  1. In stock 2 items
  2. Out of stock 715 items Remove This Item
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