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
YHM 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…
Earn 15 Points - Gun Parts, Upper Receivers & Conversion Kits
CAA Micro Roni Gen 2 for Glock 43/48 Chassis Pistol Brace Polymer Black Finish MCK43/48GEN2
This 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…
Earn 229 Points - 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
This 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…
Earn 299 Points - Gun Parts, Misc Gun Parts, Upper Receivers & Conversion Kits
CAA MCK Micro Conversion Kit for S&W SD9/SD40 w/Brace Black
CAA MCK Micro Conversion Kit for S&W SD9/SD40 w/Brace Black
Earn 229 Points - Gun Parts, Misc Gun Parts, Upper Receivers & Conversion Kits
CAA MCK Micro Roni Conversion Kit for S&W Shield 9MM/40SW
The 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…
Earn 229 Points - Gun Parts, Misc Gun Parts, Upper Receivers & Conversion Kits
CAA Micro Roni Conversion Kit for SIG P320 Chassis Pistol Brace Polymer Black MCKSIG
Command 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…
Earn 229 Points - AR AK Parts, Gun Parts, Upper Receivers & Conversion Kits
CAA MCK Micro Conversion Kit Smith & Wesson M&P Black
CAA 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…
Earn 229 Points