Build Kits

Build your pistol caliber AR confidently by selecting all-American Made pistol build kits and caliber AR parts.

MORIARTI ARMS ® AR9 BUILDS HAVE BEEN SPECIFICALLY DESIGNED FOR SUPERIOR RELIABILITY AND MAXIMUM PERFORMANCE AND ACCURACY. MORIARTI'S MA9 DIFFERENCE - ALL BILLET BUILD, NOTHING FORGED, AT COMPETITIVE LOW PRICES. FEATURING MORIARTI ARMS BILLET MA-9 GLOCK STYLE LOWER RECEIVERS TO COMPLETE YOUR AR-9 LOOK WITH OR WITHOUT LAST ROUND BOLT HOLD OPEN. PLEASE NOTE: FOR BEST PERFORMANCE, PLEASE PAIR THE BUILD WITH OUR MORIARTI ARMS LOWERS. WE CANNOT GUARANTEE PERFORMANCE WITH OTHER MANUFACTURERS SUCH AS PALMETTO AND CMMG.
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  • AR-15 Double Play: AR-15 5.56 AND AR 9MM 16" RIFLE BUILDS KIT /TORKMAG / 12" MLOK
    AR-15 Double Play: AR-15 5.56 AND AR 9MM 16" RIFLE BUILDS KIT W/TORKMAG ADAPTER. All you need is your AR-15 lower receiver (not included) to enjoy 5.56 and 9mm at the range. Swap your uppers anD mags for a happy shooting!  All components are Mil Spec and made in the USA. Product Specifics:..
    AR-15 Double Play: AR-15 5.56 AND AR 9MM 16" RIFLE BUILDS KIT W/TOR...
    $569.95$999.95
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  • AR 10MM 16" Slick Side Rifle Kit / NON- LRBHO /  Mlok / Alpha
    AR 10MM 16" Slick Side Rifle Kit / NON- LRBHO /  Mlok / Alpha IS BUILD ON A SLICK SIDE BILLET UPPER RECEIVER, WITHOUT LRBHO.  This kit is compatible with AR-45 Glock Style lower receiver and Glock 20 Mags.  AR-10MM 16" KIT FEATURES:BARREL - 16" 10MM MATCH..
    AR 10MM 16" Slick Side Rifle Kit / NON- LRBHO /  Mlok / Alpha ...
    $599.95$799.95
  • AR 10mm 8" SLICK SIDE PREMIUM PISTOL KIT / SHROUD / MLOK / SBA3
    AR 10mm 8" SLICK SIDE PREMIUM PISTOL KIT / SHROUD / MLOK / SBA3 - KIT COMES WITH EVERYTHING YOU NEED TO COMPLETE YOUR 10mm BUILD EXCEPT LOWER RECEIVER, CAN BE PURCHASED SEPARATELY. This kit is compatible with AR-45 Glock Style lower receiver and large frame Glock 20 Mags. NOTE: Images may not ..
    AR 10mm 8" SLICK SIDE PREMIUM PISTOL KIT / SHROUD / MLOK / SBA3 -&n...
    $599.95$799.95
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  • AR 40 S&W 16" Slick Side Rifle Kit / NON-LRBHO / Mlok / Magpul SL
    AR 40S&W 16" MA-40 Slick Side Rifle Kit  IS BUILD ON A SLICK SIDE BILLET UPPER RECEIVER, WITHOUT LRBHO.  KIT COMES WITH EVERYTHING YOU NEED TO COMPLETE YOUR BUILD EXCEPT THE LOWER RECEIVER, CAN BE PURCHASED SEPARATELY. This kit is compatible with AR-9 Glock Style lower r..
    AR 40S&W 16" MA-40 Slick Side Rifle Kit  IS BUILD ON&...
    $599.95$899.95
  • AR 9MM 9" PISTOL BUILD KIT/10" M-LOK / DIVERTER / SBA3 / SLICK
    AR 9MM 9" PISTOL BUILD KIT/10" M-LOK / DIVERTER / SBA3 - includes everything to complete your AR-9 project EXCEPT 80% lower. NOTE: Images may not be an exact representation of the product. Features:Barrel - 9" 4150 CMV barrel, 1/2x36 thread, 1x10 twist. Blowback extension. C..
    AR 9MM 9" PISTOL BUILD KIT/10" M-LOK / DIVERTER / SBA3 - includes e...
    $429.95$799.95
  • AR-10MM 4.5" MLOK COMPLETE PISTOL KIT /SLICK SIDE/NON-LRBHO
    Moriarti Arms, Blow Back, 10MM, 4.5" Barrel, Black Finish, Slick side upper, Non-LRBHO, Mlok, Glock compatibleBARREL - 4.5" 10MM MATCH GRADE AR BARREL. 4150 CROMOLY STEEL. BLACK NITRIDE FINISH. CHAMBERED IN 10mm AR platform.  TWIST: 1:16. 5/8-24 MUZZLE BRAKE THREADS. BLOWBACK. BARREL IS FI..
    Moriarti Arms, Blow Back, 10MM, 4.5" Barrel, Black Finish, Slick si...
    $499.95$699.95
  • AR-40 40 S&W 10.5" Pistol Build Kit / 10" M-LOK / DIVERTER / SBA3 / SLICK
    AR-40 40 S&W 10.5" Pistol Build Kit / 10" M-LOK / DIVERTER / SBA3 / SLICK contains all the components to complete your AR-40 S&W project. This kit is based on Mil Spec slick side upper and designed to work Glock style lowers. The kit comes with everything you need EXCEPT 80% lower ..
    AR-40 40 S&W 10.5" Pistol Build Kit / 10" M-LOK / DIVERTER / SB...
    $669.95$899.95
  • AR-40 40 S&W 4.5" MICRO PISTOL BUILD KIT / MLOK/ CLASSIC
    AR-40 40 S&W 4.5" MICRO PISTOL BUILD KIT / MLOK/ CLASSIC contains all components to complete your AR-40 build. The kit comes WITHOUT 80% stripped lower receiver.  All components are Mil Spec and made in the USA.  Barrel: 4.5" 4150 CMV M4 Profile Chamber: 40 S&W..
    AR-40 40 S&W 4.5" MICRO PISTOL BUILD KIT / MLOK/ CLASSIC c...
    $499.95$699.95
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  • AR-40 40 S&W 8" Micro Pistol Build Kit / Slim Octagonal Cone / ADJ Shockwave
    AR-40 40 S&W 8" Micro Pistol Build Kit / Slim Octagonal Cone / ADJ Shockwave contains all the components to complete your AR-40 S&W project. This kit is based on Mil Spec slick side upper and designed to work Glock style lowers. The kit comes with everything you need EXCEPT 80% low..
    AR-40 40 S&W 8" Micro Pistol Build Kit / Slim Octagonal Cone / ...
    $549.95$899.95
  • AR-45 .45 ACP 16" MLOK COMPLETE RIFLE KIT W/HEAVY BUFFER, NON-LRBHO
    MORIARTI ARMAMENTS IS PROUD TO PRESENT AN INTRODUCTORY KIT FOR AR-45 .45 ACP 16" MLOK COMPLETE RIFLE KIT W/HEAVY BUFFER, NON-LRBHO.  KIT COMES WITH EVERYTHING YOU NEED TO COMPLETE YOUR AR-45 BUILD EXCEPT 80% LOWER RECEIVER, CAN BE PURCHASED SEPARATELY.  AR-45 RIFLE KIT FEATUR..
    MORIARTI ARMAMENTS IS PROUD TO PRESENT AN INTRODUCTORY KIT FOR ...
    $499.95$749.99
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  • AR-45 .45 ACP 16" UNASSEMBLED UPPER KIT /BCG AND CH / MLOK / NON-LRBHO
    AR-45 .45 ACP 16" MLOK UNASSEMBLED UPPER KIT W/ BCG, NON-LRBHO BARREL - 16" 45 ACP MATCH GRADE AR BARREL. 4150 CROMOLY STEEL. BLACK NITRIDE FINISH. CHAMBERED IN 45 ACP.  TWIST: 1:16. 5/8-24 MUZZLE BRAKE THREADS. INTEGRATED FEED RAMP. BARREL IS FINISHED OFF WITH A2 FLASH HIDER DE..
    AR-45 .45 ACP 16" MLOK UNASSEMBLED UPPER KIT W/ BCG, NON-LRBHO B...
    $349.95$549.99
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  • AR-45 .45 ACP 4.5" MLOK COMPLETE PISTOL KIT /SLICK SIDE/NON-LRBHO
    Moriarti Arms, Blow Back, 45 ACP, 4.5" Barrel, Black Finish, Slick side upper, Non-LRBHO, MlokBARREL - 4.5" 45 ACP MATCH GRADE AR BARREL. 4150 CROMOLY STEEL. BLACK NITRIDE FINISH. CHAMBERED IN 45 ACP.  TWIST: 1:16. 5/8-24 MUZZLE BRAKE THREADS. BLOWBACK. BARREL IS FINISHED OFF WITH A2 FLASH..
    Moriarti Arms, Blow Back, 45 ACP, 4.5" Barrel, Black Finish, Slick ...
    $499.95$799.95
  • AR-45 .45 ACP 7.5" MLOK COMPLETE PISTOL KIT W/HEAVY BUFFER, NON-LRBHO
    MORIARTI ARMAMENTS IS PROUD TO PRESENT AN INTRODUCTORY KIT FOR AR-45 .45 ACP 7f.5" MLOK COMPLETE PISTOL KIT W/HEAVY BUFFER, NON-LRBHO.  KIT COMES WITH EVERYTHING YOU NEED TO COMPLETE YOUR AR-45 BUILD EXCEPT LOWER RECEIVER, CAN BE PURCHASED SEPARATELY.  AR-45 PISTOL KIT FEATURES: ..
    MORIARTI ARMAMENTS IS PROUD TO PRESENT AN INTRODUCTORY KIT FOR AR-4...
    $499.95$699.99
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  • AR-45 .45 ACP 8" SLICK SIDE PREMIUM CONE PISTOL KIT / MLOK / LRBHO
    AR-45 .45 ACP 8" SLICK SIDE PREMIUM CONE PISTOL KIT / MLOK / LRBHO IS BUILD ON A SLICK SIDE BILLET UPPER RECEIVER WITH LRBHO (LAST ROUND BOLT HOLD OPEN).  KIT COMES WITH EVERYTHING YOU NEED TO COMPLETE YOUR AR-45 BUILD EXCEPT LOWER RECEIVER, CAN BE PURCHASED SEPARATELY. AR-4..
    AR-45 .45 ACP 8" SLICK SIDE PREMIUM CONE PISTOL KIT / MLOK / LRBHO&...
    $599.95$759.99
  • AR-45 45 ACP 7.5" Micro Pistol Build Kit / Shroud / Mlok / SBA3
    AR-45 45 ACP 7.5" Micro Pistol Build Kit / Shroud / Mlok / SBA3 kit is based on Mil Spec AR-15 upper and designed to work with Glock style lowers. The kit comes with everything you need to complete your AR45 project EXCEPT 80% lower receiver. Can be purchased separately.  All componen..
    AR-45 45 ACP 7.5" Micro Pistol Build Kit / Shroud / Mlok / SBA3&nbs...
    $599.95$899.95
  • AR-9 16" RIFLE BUILD KIT / 15" M-LOK / MAGPUL SL STOCK
    AR-9 16" RIFLE BUILD KIT / 15" M-LOK / MAGPUL SL STOCK Kit Includes all components to finish your AR-9 project EXCEPT 80% lower receiver (sold separately). Comes unassembled. All components are Mil Spec and USA Made. (1) 9MM 1X19 16" Barrel 1:10 Twist/Nitride(1) 9MM tapered Complete Bolt Carrie..
    AR-9 16" RIFLE BUILD KIT / 15" M-LOK / MAGPUL SL STOCK Kit Includes...
    $549.95$849.95
  • AR-9 9MM 10.5" Micro Pistol Build Kit / Shroud / Mlok / SBA3
    AR-9 9MM 10.5" Micro Pistol Build Kit / Shroud / Mlok / SBA3 kit is based on Mil Spec upper and designed to work Glock style lowers. The kit comes with everything you need to complete your AR9 project EXCEPT 80% lower receiver. Can be purchased separately.  All components are Mil Spec..
    AR-9 9MM 10.5" Micro Pistol Build Kit / Shroud / Mlok / SBA3 k...
    $499.95$799.95
  • AR-9 9MM 16" carbine rifle kit / 15" Slim Mlok Rail / LE Stock
    AR-9 9MM 16" carbine rifle kit w/ 15" Slim Mlok Rail- Glock Style kit contains all the components to complete your AR-9 project. This kit is based on Mil Spec upper and designed to work with both Colt/RR and Glock style lowers. The kit comes with everything you need to complete your AR9 ri..
    AR-9 9MM 16" carbine rifle kit w/ 15" Slim Mlok Rail- Glock Style k...
    $399.95$599.95
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  • AR-9 9MM 16" carbine tactical rifle kit / 12" Mlok / Adaptive Stock
    AR-9 9MM 16" carbine mlok tactical rifle kit - Glock Style kit contains all the components to complete your AR-9 project. This kit is based on Mil Spec upper and designed to work with both Colt/RR and Glock style lowers. The kit comes with everything you need to complete your AR9 rifle EXC..
    AR-9 9MM 16" carbine mlok tactical rifle kit - Glock Style kit cont...
    $419.95$599.95
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  • AR-9 9MM 4.5" AFTERBURNER PISTOL BUILD KIT / MLOK / NON-LRBHO
    AR-9 9MM 4.5" MLOK COMPLETE PISTOL KIT W/HEAVY BUFFER, NON-LRBHO / NO LOWER - GLOCK COMPATIBLE Barrel Length: 4.5" Barrel Profile: Heavy Barrel Steel: Chrome Moly Vanadium  Barrel Finish: Nitride  Muzzle Thread: 1/2-36 Chamber: 9mm (9x19) Twist Rate: 1 in 10" Barrel Extension: Bl..
    AR-9 9MM 4.5" MLOK COMPLETE PISTOL KIT W/HEAVY BUFFER, NON-LRBHO / ...
    $399.95$549.95
  • AR-9 9MM 4.5" AFTERBURNER PISTOL BUILD KIT / MLOK/ SBA3 BRACE
    AR-9 9MM 4.5" ENHANCED PISTOL BUILD KIT W/ SBA3 BRACE - Glock Style kit contains all the components to complete your AR-9 project. This kit is based on Mil Spec upper and designed to work with both Colt/RR and Glock style lowers. The kit comes with everything you need to complete your AR-9..
    AR-9 9MM 4.5" ENHANCED PISTOL BUILD KIT W/ SBA3 BRACE - Glock Style...
    $449.95$649.95
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  • AR-9 9MM 4.5" TRIDENT PISTOL BUILD KIT / SLICK SIDE / SHOCKWAVE
    Make your own AR-9 at a fraction of a cost!  All components are Mil Spec and made in the USA.  Everything listed comes in the kit, except the lower receiver, sold separately.  Kit Contains:9mm Upper Receiver, Slick Side, no dust cover or forward assist9mm Nitride Complete BCGMil-Sp..
    Make your own AR-9 at a fraction of a cost!  All components ar...
    $429.95$699.95
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  • AR-9 9MM 5" UNASSEMBLED PISTOL UPPER / BCG AND CHARGING HANDLE / MLOK
    AR-9 9MM 5" UNASSEMBLED PISTOL UPPER  WITH BCG AND CHARGING HANDLE Barrel Length: 5" Barrel Profile: Heavy Barrel Steel: 4150 Chrome Moly Vanadium  Barrel Finish: Nitride  Muzzle Thread: 1/2-36 Chamber: 9mm (9x19) Twist Rate: 1 in 10" Barrel Extension: 9mm Muzzle Device: 9M..
    AR-9 9MM 5" UNASSEMBLED PISTOL UPPER  WITH BCG AND CHARGING HA...
    $249.95$399.95
  • AR-9 9MM 5.5" CLASSIC PISTOL BUILD KIT / MLOK / ADJ SHOCKWAVE
    AR-9 9MM 5.5" CLASSIC PISTOL BUILD KIT / MLOK / ADJ SHOCKWAVE Barrel Length: 5.5" Barrel Profile: Heavy Barrel Steel: Chrome Moly Vanadium  Barrel Finish: Nitride  Muzzle Thread: 1/2-36 Chamber: 9mm (9x19) Twist Rate: 1 in 10" Barrel Extension: Blowback Muzzle Device: A-2 Birdca..
    AR-9 9MM 5.5" CLASSIC PISTOL BUILD KIT / MLOK / ADJ SHOCKWAVE Ba...
    $419.95$599.95
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  • AR-9 9MM 7.5" AFTERBURNER PISTOL BUILD KIT / MLOK / NON-LRBHO
    AR-9 9MM 7.5" MLOK COMPLETE PISTOL KIT W/HEAVY BUFFER, NON-LRBHO / NO LOWER Barrel Length: 7.5" Barrel Profile: Heavy Barrel Steel: Chrome Moly Vanadium  Barrel Finish: Nitride  Muzzle Thread: 1/2-36 Chamber: 9mm (9x19) Twist Rate: 1 in 10" Barrel Extension: Blowback Muzzle Devi..
    AR-9 9MM 7.5" MLOK COMPLETE PISTOL KIT W/HEAVY BUFFER, NON-LRBHO / ...
    $399.95$549.95
  • AR-9 9MM 7.5" SLICK SIDE PREMIUM CONE PISTOL KIT/ LRBHO /MLOK
    AR-9 9MM 7.5" LRBHO "SLICK SIDE" PREMIUM CONE PISTOL KIT IS BUILD ON A SLICK SIDE BILLET UPPER RECEIVER WITH LRBHO (LAST ROUND BOLT HOLD OPEN).  KIT COMES WITH EVERYTHING YOU NEED TO COMPLETE YOUR AR-9 BUILD EXCEPT LOWER RECEIVER, CAN BE PURCHASED SEPARATELY. AR-9 LRBHO KIT ..
    AR-9 9MM 7.5" LRBHO "SLICK SIDE" PREMIUM CONE PISTOL KIT IS BU...
    $559.95$699.99
  • AR-9 9MM 9" Complete Pistol Kit / Shockwave / Knurled Cone / Slick Side
    AR-9 9MM 9" Complete Pistol Kit / Shockwave / Non-LRBHO / Slick Side kit.  All components are Mil Spec and made in the USA.  Does not include 80% lower receiver. Comes in anodized black. NOTE: Images may not be an exact representation of the product. Please Read Our Statemen..
    AR-9 9MM 9" Complete Pistol Kit / Shockwave / Non-LRBHO / Slick Sid...
    $449.95$699.95
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  • AR-9 PISTOL KIT – 7″ / 9MM / M-LOK / SBA3 BRACE / NON-LRBHO
    AR-9 PISTOL KIT – 7″ / 9MM / M-LOK / SBA3 BRACE / NON-LRBHOTHIS KIT INCLUDES EVERYTHING YOU NEED TO BUILD AN AR PISTOL EXCEPT A STRIPPED LOWER. *Non-Lock Back! The receiver is a flat top slick side non-lrbho biller upper receiver CNC Machined from 7075-T6 Aluminum, the hardest and most durable mater..
    AR-9 PISTOL KIT – 7″ / 9MM / M-LOK / SBA3 BRACE / NON-LRBHOTHIS KIT...
    $479.95$649.99
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  • MA-9 9MM 4.5" MICRO GLOCK STYLE PISTOL KIT / FDE / NON-LRBHO
    MA-9 9MM 4.5" MICRO GLOCK STYLE PISTOL KIT / FDE / NON-LRBHO includes everything to complete your DIY 9MM project EXCEPT 80% lower receiver. Pistol Kit features:BARREL - 4.5" 4150 CMV STEEL GOVERNMENT PROFILE BARREL. HARDENED TO 26-32 RC AND STRESS RELIEVED.  CHAMBERED IN 9MM, 1-10 RH..
    MA-9 9MM 4.5" MICRO GLOCK STYLE PISTOL KIT / FDE / NON-LRBHO includ...
    $549.95$879.95