I have the new MP44 from PTR91 made by sport systeme dittrich in Germany. In regards to blanks what do most people use? I bought some the other day and they will not feed into the chamber. When you release the bolt to try and chamber a round it does not properly chamber the round. I then took some live ammo and it worked perfectly. Once I examined the blanks further I noticed that the headspacing on the blank itself is not consistent. I have a blank adapter from Guillette manufacturing and just wanted to see what blanks most people use out of their rifle. Any help would be appreciated. Thanks.