Teufelshund Tactical Heckler and Koch Bolt Gap Review

This video covers the much misunderstood topic of bolt gap, as it relates to the Heckler and Koch roller delayed blowback line of weapons, provided from my extensive background as an Armorer and Instructor of Heckler and Koch weapons.  In it, I cover the background and function, how to check bolt gap and how to affect a change in bolt gap, if needed.