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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 97-112 of 748

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  1. KNS Precision AR15 AR/MCX Stock Adapter With Flange
    KNS Precision AR15 AR/MCX Stock Adapter With Flange
    $51.00
    Out of stock
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  2. A3 Tactical Offset Modular Side Folding Arm Brace for Tailhook - CZ Scorpion
    A3 Tactical Offset Modular Side Folding Arm Brace for Tailhook - CZ Scorpion
    $237.45
    Out of stock
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  3. Aero Precision Low Profile Adjustable Gas Block - .625
    Aero Precision Low Profile Adjustable Gas Block - .625
    $71.99
    Out of stock
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  4. Faxon Firearms AR-15 Heavy Fluted Profile 6mm ARC 5R Nitride Barrel - 20"
    Faxon Firearms AR-15 Heavy Fluted Profile 6mm ARC 5R Nitride Barrel - 20"
    $312.80
    Out of stock
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  5. Faxon Firearms AR-15 Gunner 6mm ARC 5R Nitride Barrel - 12.5"
    Faxon Firearms AR-15 Gunner 6mm ARC 5R Nitride Barrel - 12.5"
    $216.20
    Out of stock
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  6. Ballistic Advantage Modern Series 5.56 Goverment Barrel - 20"
    Ballistic Advantage Modern Series 5.56 Goverment Barrel - 20"
    $185.25
    Out of stock
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  7. HiperFire PDI Black AR15/10/PCC Drop In Trigger Assembly - RG
    HiperFire PDI Black AR15/10/PCC Drop In Trigger Assembly - RG
    $171.00
    Out of stock
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  8. HiperFire PDI Black AR15/10/PCC Drop In Trigger Assembly - GS
    HiperFire PDI Black AR15/10/PCC Drop In Trigger Assembly - GS
    $171.00
    Out of stock
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  9. Aero Precision AR15 BREACH Ambi Charging Handle - Black
    Aero Precision AR15 BREACH Ambi Charging Handle - Black
    Out of stock
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  10. Dead Air Sandman Flash Hider Front Cap - 5.56
    Dead Air Sandman Flash Hider Front Cap - 5.56
    $89.00
    Out of stock
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  11. Ballistic Advantage Modern Series 300BLK Barrel - 9"
    Ballistic Advantage Modern Series 300BLK Barrel - 9"
    $152.00
    Out of stock
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  12. Aero Precision EPC-9 Receiver Set - Black
    Aero Precision EPC-9 Receiver Set - Black
    $334.98
    Out of stock
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  13. Ballistic Advantage Modern Series 5.56 NATO Government Profile Barrel - 11.5"
    Ballistic Advantage Modern Series 5.56 NATO Government Profile Barrel - 11.5"
    $147.25
    Out of stock
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  14. Faxon Firearms AR-15 Gunner 6mm ARC 5R Nitride Barrel - 16"
    Faxon Firearms AR-15 Gunner 6mm ARC 5R Nitride Barrel - 16"
    $225.40
    Out of stock
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  15. Aero Precision EPC-9 Lower Receiver - Black
    Aero Precision EPC-9 Lower Receiver - Black
    $169.99
    Out of stock
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  16. James Madison Tactical (JMT) Anti-Rotation/Anti-Walk Pins
    James Madison Tactical (JMT) Anti-Rotation/Anti-Walk Pins
    $14.95
    Out of stock
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Items 97-112 of 748

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Barrel Length
  1. 3.66" 1 item
  2. 4" 1 item
  3. 5.5" 5 items
  4. 6" 2 items
  5. 6.5" 1 item
  6. 7" 1 item
  7. 7.5" 1 item
  8. 7.94" 1 item
  9. 8" 5 items
  10. 8.3" 3 items
  11. 8.5" 8 items
  12. 9" 4 items
  13. 9.5" 1 item
  14. 9.75" 1 item
  15. 10.3" 4 items
  16. 10.5" 9 items
  17. 11" 1 item
  18. 11.5" 7 items
  19. 12" 4 items
  20. 12.5" 5 items
  21. 13.7" 2 items
  22. 13.9" 2 items
  23. 14.5" 9 items
  24. 16" 35 items
  25. 16.1" 1 item
  26. 16.3" 1 item
  27. 18" 17 items
  28. 20" 12 items
  29. 22" 11 items
Barrel Profile
  1. Full-fluted 2 items
  2. Non-fluted 2 items
Caliber
  1. .22 ARC 2 items
  2. .22 LR 1 item
  3. .223/5.56 5 items
  4. .223 Wylde 7 items
  5. .30-30 1 item
  6. .30 Cal 5 items
  7. .308 4 items
  8. .308 Win 6 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 24 items
  17. 5.56X45 4 items
  18. 5.56 NATO 56 items
  19. 5.56mm 3 items
  20. 6mm ARC 3 items
  21. 6.5 Creedmoor 6 items
  22. 6.5 Grendel 4 items
  23. 6MM Creedmoor 6 items
  24. 7.62mm 4 items
  25. 7.62x39 4 items
  26. 7.62x51 3 items
  27. 8.6 Blackout 1 item
  28. 9mm 28 items
Category
  1. Receiver Parts 176 items
  2. Parts & Kits 70 items
  3. Barrels 14 items
  4. Rifle Barrels 70 items
  5. Buffer Systems 26 items
  6. Trigger Parts 62 items
  7. Gas Systems 21 items
  8. Muzzle Devices 69 items
  9. Bolt Parts 46 items
  10. Grips 38 items
  11. Charging Handles 24 items
  12. Rifle Handguards 78 items
  13. Stocks & Braces 50 items
  14. MILSPEC Parts 3 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. M-LOK 4 items
  12. M4 Curve 1 item
  13. Mil-Spec 1 item
  14. Rifle 1 item
  15. Straight 1 item
  16. .625 DIA 3 items
  17. .750 DIA 18 items
  18. .936 DIA 1 item
  19. Standard Buffer and Spring 1 item
Finish
  1. Arid 2 items
  2. Bead Blast 1 item
  3. Black 10 items
  4. Black Nitride 3 items
  5. Cerakote 5 items
  6. Chrome 1 item
  7. DLC 3 items
  8. FDE 2 items
  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. Red 2 items
  17. Satin 7 items
  18. Anodize 28 items
  19. Clear Hard Anodize 4 items
  20. Quench Polish Quench (QPQ) 2 items
  21. Titanium Nitride (TiN) 2 items
Gas Block Diameter
  1. .625" 3 items
  2. .750" 40 items
  3. .875" 5 items
Gas Length
  1. Pistol 12 items
  2. Carbine 14 items
  3. Mid 37 items
  4. Intermediate 10 items
  5. Rifle 13 items
  6. Rifle +1 2 items
  7. Rifle +2 3 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 11 items
  2. Aero Precision 48 items
  3. Aeroknox 8 items
  4. Agency Arms 1 item
  5. ALG Defense 2 items
  6. Angstadt Arms 10 items
  7. Apex Tactical Specialties 1 item
  8. Armaspec 8 items
  9. Arms Republic 4 items
  10. Ascalon Arms 4 items
  11. Brügger & Thomet (B&T) 1 item
  12. B5 Systems 1 item
  13. Ballistic Advantage 23 items
  14. Battle Arms Development 35 items
  15. Blackout Defense 8 items
  16. Blitzkrieg Components 6 items
  17. Bootleg 2 items
  18. Bravo Company MFG (BCM) 30 items
  19. Centurion Arms 10 items
  20. Chisel Machining 1 item
  21. CMMG 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. Ergo Grips 7 items
  30. F5 MFG 12 items
  31. Faxon Firearms 45 items
  32. Fortis MFG 10 items
  33. Forward Controls Design 7 items
  34. FosTecH 2 items
  35. Foxtrot Mike 2 items
  36. Gear Head Works 3 items
  37. Geissele 19 items
  38. Grey Birch MFG 7 items
  39. Griffin Armament 8 items
  40. HB Industries 9 items
  41. HERA ARMS 7 items
  42. Heresy Design 1 item
  43. Hiperfire 15 items
  44. HUXWRX 5 items
  45. Icon Defense 1 item
  46. James Madison Tactical (JMT) 1 item
  47. JMAC Customs 10 items
  48. JP Enterprises Inc 8 items
  49. Kinetic Development Group 5 items
  50. Knight’s Armament Company (KAC) 14 items
  51. KNS Precision 4 items
  52. Kalashnikov USA 2 items
  53. Krebs Customs 2 items
  54. KynSHOT 2 items
  55. Lantac 16 items
  56. Law Tactical 1 item
  57. Lee Sporting 3 items
  58. Lewis Machine & Tool (LMT) 8 items
  59. Mad Pig 1 item
  60. Magpul Industries 9 items
  61. Matador Arms 1 item
  62. Maxim Defense 8 items
  63. Midwest Industries 23 items
  64. NEMO Arms 3 items
  65. Next Level Armament 5 items
  66. Noveske 30 items
  67. Obsidian Arms 1 item
  68. Patriot Ordnance Factory (POF) 2 items
  69. Precision Armament 4 items
  70. Primary Weapon Systems 9 items
  71. Q, LLC 4 items
  72. R&D Precision 1 item
  73. Radian Weapons 2 items
  74. Rainier Arms, LLC 37 items
  75. SB Tactical 5 items
  76. Sharps Bros 8 items
  77. Sig Sauer 3 items
  78. Silencerco 9 items
  79. Sionics Weapon Systems 5 items
  80. SLR Rifleworks 4 items
  81. Sons of Liberty Gun Works 9 items
  82. Spinta Precision 4 items
  83. Springer Precision 1 item
  84. Stern Defense 6 items
  85. Strike Industries 1 item
  86. Surefire 8 items
  87. Taran Tactical Innovations 1 item
  88. Timney Triggers 2 items
  89. Triggertech 6 items
  90. Troy Industries 7 items
  91. TruCalibre 3 items
  92. Tyrant Designs 4 items
  93. V Seven Weapon Systems 14 items
  94. VLTOR 6 items
  95. WMD Guns 4 items
  96. WOOX 1 item
Model
  1. CZ Bren 1 item
  2. CZ Scorpion 8 items
  3. FNH Scar 1 item
  4. H&K G36 1 item
  5. IWI Galil 1 item
  6. Remington 700 1 item
  7. Sig MCX 5 items
  8. Sig MPX 1 item
Mount
  1. KeyMod 8 items
  2. M-LOK 61 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-15 122 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 15 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 16 items
  28. MCS 2 items
  29. Full Size 2 items
  30. Dimpled 1 item
Platform
  1. 10-22 1 item
  2. AR-9 1 item
  3. AR-10 4 items
  4. AR-15 51 items
  5. AK47/74 5 items
  6. CZ-USA 9 items
  7. FNH 1 item
  8. IWI 1 item
  9. Remington 1 item
  10. Remington 700 5 items
  11. Ruger 5 items
  12. Savage Small Shank 4 items
  13. Sig Sauer 7 items
Price
  1. $0.00 - $999.99 723 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. 10/22 Receiver 1 item
  3. Accessory 1 item
  4. Angled Grip 6 items
  5. Anti Walk Pins 3 items
  6. AR-10 Barrel 1 item
  7. AR-10 / LR 308 Charging Handle 2 items
  8. AR-10 Partial Upper Receiver 2 items
  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 2 items
  15. AR-15 Charging Handle 11 items
  16. AR-15 Complete Lower Receiver 22 items
  17. AR-15 Complete Upper Receiver 25 items
  18. AR-15 Partial Upper Receiver 19 items
  19. AR-15 Handguard 30 items
  20. AR-15 Receiver Set 8 items
  21. AR-15 Stripped Lower Receiver 23 items
  22. AR-15 Stripped Upper Receiver 24 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 7 items
  27. Barrel 69 items
  28. Blast Shield 2 items
  29. Bolt 6 items
  30. Bolt-Action Barrel 9 items
  31. Bolt Carrier Group 34 items
  32. Bolt Catch 6 items
  33. Brace 10 items
  34. Buffer 11 items
  35. Buffer Kit 6 items
  36. Buffer Spring 1 item
  37. Buffer Tube 6 items
  38. Builders Kit 1 item
  39. Cam Pin 1 item
  40. Charging Handle 8 items
  41. Chassis 11 items
  42. Compensator 6 items
  43. Complete Upper 11 items
  44. Dust Cover 2 items
  45. End Plate 3 items
  46. Firing Pin 2 items
  47. Flash Hider 17 items
  48. Forearm Accesory 4 items
  49. Forward Assist 1 item
  50. Gas Block 17 items
  51. Gas Tube 2 items
  52. Grip Accessory 1 item
  53. Grip Module 1 item
  54. Gunsmithing Tool 1 item
  55. Handguard 27 items
  56. Handgun 1 item
  57. Handstop 13 items
  58. Iron Sight 1 item
  59. Lower Parts Kit 9 items
  60. Lower Receiver 3 items
  61. Magazine Catch 2 items
  62. Magazine Release 5 items
  63. Magwell 1 item
  64. Muzzle Brake 38 items
  65. Muzzle Device Accessory 6 items
  66. Parts Kit 1 item
  67. Patch 1 item
  68. Pistol Grip 12 items
  69. Piston System 1 item
  70. Port Door 1 item
  71. Rail Adapter 2 items
  72. Rail Panel 4 items
  73. Rail Section 2 items
  74. Recoil Spring 1 item
  75. Retainer Pin 1 item
  76. Safety Selector 18 items
  77. Scope Mount 1 item
  78. Shim Set 2 items
  79. Sight Post 4 items
  80. Silent Captured Spring 1 item
  81. Sling Mount 2 items
  82. Spring 1 item
  83. Stock 26 items
  84. Stock Accessory 5 items
  85. Stock Adapter 8 items
  86. Take Down / Pivot Pins 6 items
  87. Trigger 52 items
  88. Trigger / Hammer Pins 1 item
  89. Trigger Guard 2 items
  90. Trigger Spring 1 item
  91. Upper Parts Kit 1 item
  92. Vertical Grip 5 items
  93. 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" 1 item
  11. 8" 2 items
  12. 8.25" 1 item
  13. 8.5" 1 item
  14. 9" 3 items
  15. 9.5" 7 items
  16. 9.55" 1 item
  17. 9.6" 3 items
  18. 10" 15 items
  19. 10.5" 6 items
  20. 10.7" 1 item
  21. 10.75" 1 item
  22. 11.5" 2 items
  23. 12" 14 items
  24. 12.25" 1 item
  25. 12.4" 2 items
  26. 12.5" 3 items
  27. 12.625" 1 item
  28. 13" 8 items
  29. 13.5" 2 items
  30. 13.6" 4 items
  31. 13.625" 2 items
  32. 13.7" 4 items
  33. 13.8" 2 items
  34. 14" 2 items
  35. 15" 27 items
  36. 15.25" 1 item
  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 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 13 items
Thread Pitch
  1. 1.125x28 1 item
  2. 1.375-24 1 item
  3. 1/2x28 75 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 1 item
Threaded
  1. Yes 34 items
Twist Rate
  1. 1:5 1 item
  2. 1:7 30 items
  3. 1:7.5 5 items
  4. 1:8 11 items
  5. 1:10 12 items
Stock Status
  1. In stock 2 items
  2. Out of stock 746 items Remove This Item
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