Whether you are a HK UMP, XM8 orG36 fan – or a Star Wars superfan (or both) – the builds and conversion services from Tom Bostic and crew will not surprise you. TommyBuilt offers up some of the best HK “clones” of the polymer machine gun and sub machine gun models made outside of Germany. The price to entry can be steep – like the majority of the Keckler & Koch world, but the quality is nothing but top tier.
Tommybuilt has just released a 300Blk plug and play upgrade for the G36C patterned rifles. The kit is for sale through HKParts.net and links as well as details can be found below.
The Tom Bostic .300 BLK conversion barrel set up is designed to drop in any G36C or Sl8 to G36C conversion and reuse your G36C op-rod/spring set, gas piston & barrel nut. Each set up comes with the custom designed 300 blackout barrel & gas block, replacement recoil rod/spring assembly and a replacement op-rod spring plate (I’ve found that some of factory punched steel H&K plates have burrs that hang up on my gas block, it’s an easy swap if needed.) If this barrel set up is going into a new build you will need a barrel nut, C/K gas piston w/rings and the C op-rod /spring set.
This set up is drop in and you only need the proper HKparts.net barrel wrench for install or you can ship it to TommyBuilt Tactical LLC for the installation. The barrel and gas block are Black Nitride coated for longevity and resistance against wear and corrosion. They are threaded in the standard USA .30 cal 5/8×24 thread pitch and will run both super sonic & subsonic .300 Black ammo. Most subsonic ammo will not properly cycle without a suppressor like most other platforms. All NFA rules apply this is a 9″ barrel and requires an approved form 1 on standard rifles.