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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 305-320 of 827

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  1. V Seven Weapon Systems Heavy Buffer Tube - Carbine
    V Seven Weapon Systems Heavy Buffer Tube - Carbine
    $143.56
    Out of stock
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  2. SLR M-LOK RAIL SECTION
    SLR M-LOK RAIL SECTION
    Out of stock
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  3. Tyrant Designs MOD Grip Chevron Black
    Tyrant Designs MOD Grip Chevron Black
    Out of stock
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  4. Tyrant Designs MOD Standard Grip Medium
    Tyrant Designs MOD Standard Grip Medium
    $104.35
    Out of stock
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  5. 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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  7. Hera Arms Side Folding Unit (SFU)
    Hera Arms Side Folding Unit (SFU)
    $119.00
    Out of stock
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  14. Shooters Element CZ Scorpion Flat Trigger - Black
    Shooters Element CZ Scorpion Flat Trigger - Black
    $33.25
    Out of stock
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  15. Shooters Element CZ Scorpion Flat Trigger - Red
    Shooters Element CZ Scorpion Flat Trigger - Red
    $37.99
    Out of stock
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  16. Shooters Element CZ Scorpion Flat Trigger
    Shooters Element CZ Scorpion Flat Trigger
    Out of stock
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Items 305-320 of 827

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Shopping Options
Barrel Length
  1. 5.25" 1 item
  2. 5.5" 6 items
  3. 6" 2 items
  4. 6.5" 1 item
  5. 7" 1 item
  6. 7.25" 1 item
  7. 7.5" 2 items
  8. 7.94" 1 item
  9. 8" 4 items
  10. 8.3" 3 items
  11. 8.5" 5 items
  12. 9" 4 items
  13. 9.5" 1 item
  14. 9.75" 1 item
  15. 10.3" 3 items
  16. 10.5" 12 items
  17. 10.7" 1 item
  18. 11" 1 item
  19. 11.5" 11 items
  20. 11.85" 1 item
  21. 12" 5 items
  22. 12.5" 7 items
  23. 13" 1 item
  24. 13.7" 3 items
  25. 13.9" 1 item
  26. 14.5" 10 items
  27. 16" 46 items
  28. 16.1" 2 items
  29. 16.3" 1 item
  30. 18" 27 items
  31. 20" 13 items
  32. 22" 13 items
  33. 24" 1 item
Barrel Profile
  1. Dissipator 2 items
  2. DMR 2 items
  3. MK12 SPR 7 items
  4. Non-fluted 1 item
Caliber
  1. .22 ARC 4 items
  2. .223/5.56 7 items
  3. .223 Wylde 15 items
  4. .30-30 1 item
  5. .30 Cal 4 items
  6. .308 6 items
  7. .308 Win 14 items
  8. .338 1 item
  9. .38/.357 Magnum 1 item
  10. .45 ACP 1 item
  11. .458 Socom 2 items
  12. 300 Blackout 27 items
  13. 5.56X45 5 items
  14. 5.56 NATO 77 items
  15. 5.56mm 2 items
  16. 6mm ARC 7 items
  17. 6.5 Creedmoor 7 items
  18. 6.5 Grendel 4 items
  19. 6MM Creedmoor 11 items
  20. 7.62mm 3 items
  21. 7.62x39 3 items
  22. 7.62x51 3 items
  23. 8.6 Blackout 7 items
  24. 9mm 24 items
Category
  1. Receiver Parts 169 items
  2. Parts & Kits 102 items
  3. Barrels 117 items
  4. Buffer Systems 28 items
  5. Trigger Parts 45 items
  6. Gas Systems 26 items
  7. Muzzle Devices 78 items
  8. Bolt Parts 50 items
  9. Grips 48 items
  10. Charging Handles 32 items
  11. Rifle Handguards 80 items
  12. Stocks & Braces 52 items
  13. MILSPEC Parts 4 items
Co Witness
  1. Lower 1/3 1 item
Color
Configuration
  1. AR-10 2 items
  2. AR-15 11 items
  3. Carbine 1 item
  4. Curved 4 items
  5. Flat 4 items
  6. Gen 1-3 1 item
  7. GEN 2 1 item
  8. Left 1 item
  9. Left Hand 1 item
  10. M-LOK 6 items
  11. Rifle 1 item
  12. Straight 1 item
  13. .625 DIA 3 items
  14. .750 DIA 5 items
  15. .936 DIA 1 item
Finish
  1. Arid 1 item
  2. Black 6 items
  3. Black Nitride 2 items
  4. Cerakote 7 items
  5. Chrome 1 item
  6. DLC 3 items
  7. FDE 1 item
  8. Melonite 2 items
  9. NiB-X 1 item
  10. Nickel Boron 3 items
  11. Nitride 34 items
  12. Nitromet 1 item
  13. Phosphate 3 items
  14. Polished 13 items
  15. Red 1 item
  16. Satin 25 items
  17. Anodize 24 items
  18. Clear Hard Anodize 1 item
  19. Quench Polish Quench (QPQ) 4 items
  20. Titanium Nitride (TiN) 1 item
Gas Block Diameter
  1. .625" 7 items
  2. .750" 86 items
  3. .875" 10 items
  4. .936" 1 item
Gas System Length
  1. Blowback 9 items
  2. Pistol 14 items
  3. Carbine 22 items
  4. Mid 39 items
  5. Intermediate 10 items
  6. Rifle 22 items
  7. Rifle +1 2 items
  8. Rifle +2 3 items
Height
  1. Absolute Co-Witness 3 items
Inside Diameter
  1. 1.3" 1 item
  2. 1.315" 3 items
  3. 1.34" 2 items
  4. 1.4" 1 item
  5. 1.42" 1 item
  6. 1.45" 1 item
  7. 1.5" 1 item
  8. 1.55" 1 item
Manufacturer
  1. A3 Tactical 9 items
  2. Accu-Tac 1 item
  3. Advanced Armament Company (AAC) 1 item
  4. Aero Precision 52 items
  5. Aeroknox 8 items
  6. ALG Defense 1 item
  7. Angstadt Arms 9 items
  8. Apex Tactical Specialties 1 item
  9. Armaspec 9 items
  10. Arms Republic 1 item
  11. Ascalon Arms 5 items
  12. Brügger & Thomet (B&T) 3 items
  13. B5 Systems 5 items
  14. Ballistic Advantage 28 items
  15. Battle Arms Development 36 items
  16. Blitzkrieg Components 3 items
  17. Bootleg 2 items
  18. Bravo Company MFG (BCM) 36 items
  19. Centurion Arms 5 items
  20. Chisel Machining 2 items
  21. Cross Machine Tool (CMT) 8 items
  22. Daniel Defense 5 items
  23. Dead Air Armament 1 item
  24. Dead Foot Arms LLC 4 items
  25. Drew Meyers Defense 2 items
  26. Driven Arms Co. 1 item
  27. Elftmann Tactical 2 items
  28. Ergo Grips 7 items
  29. F5 MFG 10 items
  30. Faxon Firearms 37 items
  31. Ferfrans 1 item
  32. Flatline Fiber Co 1 item
  33. Fortis MFG 10 items
  34. Forward Controls Design 11 items
  35. Gear Head Works 2 items
  36. Geissele 12 items
  37. Grey Birch MFG 1 item
  38. Griffin Armament 15 items
  39. HB Industries 9 items
  40. HERA ARMS 6 items
  41. Heresy Design 1 item
  42. Hiperfire 14 items
  43. HUXWRX 4 items
  44. Icon Defense 1 item
  45. James Madison Tactical (JMT) 1 item
  46. JK Armament 3 items
  47. JMAC Customs 8 items
  48. JP Enterprises Inc 8 items
  49. Kinetic Development Group 5 items
  50. Knight’s Armament Company (KAC) 14 items
  51. KNS Precision 5 items
  52. Kalashnikov USA 2 items
  53. Kratos Design Group 1 item
  54. Krebs Customs 4 items
  55. KynSHOT 3 items
  56. Lantac 12 items
  57. Law Tactical 2 items
  58. Lee Sporting 4 items
  59. Leitner-Wise 1 item
  60. Lewis Machine & Tool (LMT) 14 items
  61. Mad Pig 2 items
  62. Mag-Pod 1 item
  63. Magpul Industries 17 items
  64. Maxim Defense 6 items
  65. Midwest Industries 20 items
  66. NEMO Arms 4 items
  67. Next Level Armament 10 items
  68. Noveske 30 items
  69. Obsidian Arms 1 item
  70. Patriot Ordnance Factory (POF) 5 items
  71. Precision Armament 7 items
  72. Primary Weapon Systems 7 items
  73. Q, LLC 10 items
  74. R&D Precision 1 item
  75. Radian Weapons 4 items
  76. Raidworx 1 item
  77. Rainier Arms, LLC 61 items
  78. Rainier Industries 1 item
  79. Reptilia Corp 5 items
  80. Rise Armament 4 items
  81. RS Regulate 1 item
  82. SB Tactical 3 items
  83. Sharps Bros 6 items
  84. Sig Sauer 7 items
  85. Silencerco 9 items
  86. Sionics Weapon Systems 5 items
  87. SLR Rifleworks 4 items
  88. Sons of Liberty Gun Works 12 items
  89. Spinta Precision 3 items
  90. Springer Precision 1 item
  91. Stag Arms 1 item
  92. Strike Industries 2 items
  93. Superlative Arms 1 item
  94. Surefire 5 items
  95. Taran Tactical Innovations 2 items
  96. Timney Triggers 2 items
  97. Triggertech 4 items
  98. Troy Industries 7 items
  99. TruCalibre 4 items
  100. Tyrant Designs 5 items
  101. V Seven Weapon Systems 39 items
  102. VKTR Industries 5 items
  103. VLTOR 6 items
  104. WMD Guns 7 items
  105. WOOX 1 item
Model
  1. CZ Bren 3 items
  2. CZ Scorpion 10 items
  3. FNH Scar 2 items
  4. H&K MP5K 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 8 items
  2. M-LOK 74 items
  3. Picatinny 26 items
Optic Footprint
  1. Aimpoint Acro 1 item
Option
  1. AK-47/74 4 items
  2. AR-9 5 items
  3. AR-10 23 items
  4. AR-15 115 items
  5. FN 509 1 item
  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. CZ 13 items
  19. FNH 1 item
  20. Glock 3 items
  21. Heckler & Koch 1 item
  22. Small Lever 1 item
  23. Large Lever 2 items
  24. AKM 1 item
  25. Green Laser 1 item
  26. Adjustable 4 items
  27. Non-Adjustable 14 items
  28. MCS 2 items
  29. Full Size 2 items
  30. IWI Uzi Pro 1 item
Platform
  1. AR-9 1 item
  2. AR-10/LR308 17 items
  3. AR-15 135 items
  4. AK47/74 4 items
  5. CZ 10 items
  6. FNH 2 items
  7. H&K 2 items
  8. IWI 1 item
  9. Remington 2 items
  10. Remington 700 9 items
  11. Ruger 1 item
  12. Ruger Precision Rifle 1 item
  13. Savage Small Shank 10 items
  14. Sig Sauer 8 items
  15. Sig MPX 1 item
  16. Steyr Aug 1 item
Price
  1. $0.00 - $999.99 803 items
  2. $1,000.00 - $1,999.99 22 items
  3. $2,000.00 - $2,999.99 1 item
  4. $4,000.00 and above 1 item
Product Type
  1. 80% Lower 2 items
  2. Accessory 1 item
  3. Angled Grip 4 items
  4. Anti Walk Pins 4 items
  5. AR-10/LR308 Barrel 15 items
  6. AR-10 / LR 308 Charging Handle 4 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 4 items
  11. AR-10 Stripped Lower Receiver 3 items
  12. AR-10 Stripped Upper Receiver 3 items
  13. AR-15 Assembled Upper Receiver 3 items
  14. AR-15 Barrel 79 items
  15. AR-15 Charging Handle 14 items
  16. AR-15 Complete Lower Receiver 22 items
  17. AR-15 Complete Upper Receiver 23 items
  18. AR-15 Partial Upper Receiver 26 items
  19. AR-15 Handguard 30 items
  20. AR-15 Receiver Set 9 items
  21. AR-15 Stripped Lower Receiver 26 items
  22. AR-15 Stripped Upper Receiver 21 items
  23. AR-15 Upper Receiver Group 1 item
  24. AR-9 Lower Receiver 3 items
  25. AR-9 Complete Lower Receiver 1 item
  26. AR-9 Receiver Set 1 item
  27. AR-9 Upper Receiver 2 items
  28. Barrel Nut 3 items
  29. Blast Shield 3 items
  30. Bolt 5 items
  31. Bolt-Action Barrel 21 items
  32. Bolt Carrier Group 36 items
  33. Bolt Catch 8 items
  34. Brace 6 items
  35. Brace Strap 1 item
  36. Buffer 10 items
  37. Buffer Kit 6 items
  38. Buffer Spring 2 items
  39. Buffer Tube 10 items
  40. Builders Kit 1 item
  41. Cam Pin 2 items
  42. Castle Nut / End Plate 2 items
  43. Charging Handle 12 items
  44. Chassis 3 items
  45. Compensator 11 items
  46. Complete Upper 8 items
  47. Dust Cover 3 items
  48. End Cap 2 items
  49. End Plate 4 items
  50. Firing Pin 3 items
  51. Flash Hider 13 items
  52. Forearm Accesory 6 items
  53. Forward Assist 4 items
  54. Gas Block 22 items
  55. Gas Tube 1 item
  56. Grip Accessory 1 item
  57. Grip Module 1 item
  58. Gunsmithing Tool 1 item
  59. Handguard 25 items
  60. Handgun 1 item
  61. Handstop 12 items
  62. Iron Sight 1 item
  63. Lower Parts Kit 10 items
  64. Lower Receiver 4 items
  65. Magazine Catch 2 items
  66. Magazine Release 8 items
  67. Magwell 3 items
  68. Muzzle Brake 40 items
  69. Muzzle Device Accessory 12 items
  70. Parts Kit 2 items
  71. Patch 1 item
  72. Pistol Grip 15 items
  73. Piston System 2 items
  74. Port Door Rod 4 items
  75. Rail Adapter 5 items
  76. Rail Cover 2 items
  77. Rail Panel 2 items
  78. Rail Section 2 items
  79. Recoil Spring 1 item
  80. Retainer Pin 3 items
  81. Safety Selector 25 items
  82. Scope Mount 1 item
  83. Shim Set 3 items
  84. Sig MPX Barrel 1 item
  85. Sight Post 2 items
  86. Sling Mount 2 items
  87. Spring 1 item
  88. Steyr Aug Barrel 1 item
  89. Stock 30 items
  90. Stock Accessory 5 items
  91. Stock Adapter 7 items
  92. Suppressor 1 item
  93. Take Down / Pivot Pins 7 items
  94. Trigger 35 items
  95. Trigger / Hammer Pins 1 item
  96. Trigger Guard 3 items
  97. Trigger Spring 1 item
  98. Upper Parts Kit 1 item
  99. Vertical Grip 11 items
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" 3 items
  8. 6.91" 1 item
  9. 7" 7 items
  10. 7.2" 1 item
  11. 7.25" 1 item
  12. 7.9" 1 item
  13. 8" 2 items
  14. 8.25" 1 item
  15. 9" 2 items
  16. 9.5" 7 items
  17. 9.55" 1 item
  18. 9.6" 2 items
  19. 9.75" 1 item
  20. 10" 11 items
  21. 10.25" 1 item
  22. 10.5" 4 items
  23. 10.7" 1 item
  24. 10.75" 1 item
  25. 10.8" 1 item
  26. 11.1" 1 item
  27. 11.5" 4 items
  28. 11.7" 1 item
  29. 12" 11 items
  30. 12.25" 1 item
  31. 12.4" 1 item
  32. 12.5" 3 items
  33. 12.625" 1 item
  34. 13" 6 items
  35. 13.5" 3 items
  36. 13.625" 1 item
  37. 13.7" 5 items
  38. 13.8" 2 items
  39. 14" 1 item
  40. 15" 27 items
  41. 15.3" 1 item
  42. 15.8" 1 item
  43. 16" 1 item
  44. 16.5" 1 item
  45. 17" 1 item
  46. 18" 1 item
Size
  1. BACK STRAP:Large 1 item
  2. BACK STRAP:Medium 2 items
  3. 3 Slot 2 items
  4. 5 Slot 2 items
  5. 7 Slot 2 items
  6. 9 Slot 15 items
Thread Pitch
  1. 1.125x28 1 item
  2. 1.375-24 1 item
  3. 1/2x28 (9mm) 15 items
  4. 1/2x28 (.22 cal) 92 items
  5. 1/2x36 2 items
  6. 3/4x24 1 item
  7. 5/8x24 (.30 cal) 74 items
  8. 5/8x32 1 item
  9. 11/16x24 2 items
  10. M18x1.5 3 items
  11. M24x1.5 RH 1 item
Threaded
  1. Yes 25 items
  2. No 2 items
Twist Rate
  1. 1:3 4 items
  2. 1:5 2 items
  3. 1:6 1 item
  4. 1:7 64 items
  5. 1:7.5 14 items
  6. 1:8 28 items
  7. 1:10 25 items
  8. 1:14 1 item
Stock Status
  1. In stock 9 items
  2. Out of stock 818 items Remove This Item
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