The frame has absolutely nothing to perform with it. It's the lockwork and tolerances. The FA is just not crafted to pretty good tolerances only for giggles. It really is done so the guns survive at 65,000psi with no shaking on their own to items. For individuals who are interested, https://top100bookmark.com/story17203937/5-tips-about-waffengesch%C3%A4ft-m%C3%BCnchen-you-can-use-today