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Firearm Gun Uppers and Conversion Kits for ARs and other rifles. Building your own gun? Looking to change the look of your current AR-15? Click-Click-Boom has hundreds of upper receivers for your rifle as well as tons of conversion kits for your guns. All of the firearm conversion kits found here are manufactured to be compatible with a wide range of guns and come complete with everything you need to change from a 5.56 to a .300 or any other popular conversion.
- AR AK Parts, AR Upper Parts, Custom AR Parts, Custom Engraving, Forward Assist / Dust Covers, Gun Parts, Upper Receivers & Conversion Kits
Yankee Hill YHM Dust Cover AR15 5.56 Marked
$15.99YHM has long been a supplier of Caliber Marked upper receivers but we soon asked oursleves What if we want to change the caliber of that upper receiver? For this…
- AR AK Parts, AR Upper Parts, Gun Parts, Upper Receivers, Upper Receivers & Conversion Kits
CMMG Echo Rimfire Conversion Kit AR-15 .22 Long Rifle 25 Round Magazine Matte Black 22BA64E
$269.99The CMMG Drop In .22 LR AR15 Conversion Kit is what you need to turn your AR-15 rifle into a plinking machine. This conversion kit converts a standard .223 Remington…
- AR & AK Magazines, AR AK Parts, AR Lower Parts, Gun Parts, Upper Receivers & Conversion Kits
CMMG Bravo .22 Long Rifle AR-15 Conversion Kit With Three 25 Round Magazines 22BA651
$299.99The CMMG Bravo .22 LR AR-15 Conversion Kit is a simple drop-in design that allows shooters to save money during recreational shooting. This stainless steel kit converts a standard .223…
- Gun Parts, Misc Gun Parts, Upper Receivers & Conversion Kits
CAA Micro Roni Gen 2 GLOCK 43/48 Chassis Pistol Brace Polymer Black Finish MCK43/48GEN2
$299.99This chassis includes all the Gen 2 upgrades featuring a new extended stabilizer that allows you to shoot while the arm brace is in the folded position. Also, it accommodates…
- Gun Parts, Misc Gun Parts, Upper Receivers & Conversion Kits
CAA MCK Micro Roni Standard Conversion Kit Fits GLOCK 17/19/45 with Pistol Brace Black
$279.99Command Arms Accessories USA is a developer and distributor of modern tactical accessories, but they are most famous for their Micro Conversion Kit or simply MCK, which has taken the…
- Gun Parts, Misc Gun Parts, Upper Receivers & Conversion Kits
CAA MCK Micro Conversion Kit for S&W SD9/SD40 w/Brace Black
$299.99CAA MCK Micro Conversion Kit for S&W SD9/SD40 w/Brace Black
- Gun Parts, Misc Gun Parts, Upper Receivers & Conversion Kits
CAA MCK Micro Roni Conversion Kit for S&W Shield 9MM/40SW
$299.99The Micro Conversion Kit for the M&P Shield is the thinnest MCK we have ever produced due to the slim nature of the handgun itself. Featuring key advantages from our…
- Gun Parts, Misc Gun Parts, Upper Receivers & Conversion Kits
CAA Micro Roni Conversion Kit for SIG P320 Chassis Pistol Brace Polymer Black MCKSIG
$279.99Command Arms Accessories USA is a developer and distributor of modern tactical accessories, but they are most famous for their Micro Conversion Kit or simply MCK, which has taken the…
- Gun Parts, Misc Gun Parts, Upper Receivers & Conversion Kits
CAA MCK Micro Roni Conversion Kit FDE for S&W M&P Shield w/Gen2 Stabilizer
$299.99The Micro Conversion Kit for the M&P Shield is the thinnest MCK we have ever produced due to the slim nature of the handgun itself. Featuring key advantages from our…
- AR AK Parts, Gun Parts, Upper Receivers & Conversion Kits
CAA MCK Micro Conversion Kit Smith & Wesson M&P Black
$279.99CAA MCKSWMP: The next generation of Micro Roni is here! We improved our past generation models into the ultimate conversion kit. It’s Micro Roni Generation 4, and we call it…
