jakjakman
03-14-10, 18:34
I seem to be having some trouble with two separate rifles, both with Noveske switchblocks. One is a 12.5" and the other is 18". The 18" rifle works fine in normal mode without a suppressor, but in suppressed mode with an AAC SPR/M4 it jams up about one in ten rounds. It's a failure to feed where the bolt over-rides the back edge of the case and jams with the round half in the chamber and two huge dents in the brass where the lugs dug into it. It only does this with the switchblock in suppressed mode with the suppressor attached. In normal mode with or without the suppressor there are no problems.
The 12.5" has the same types of cycling problems, but they happen more often. In fact, it won't cycle wolf or silver bear at all in normal w/o the suppressor, and has trouble in suppressed mode with the suppressor. It's the same kind of bolt over-ride failure which will either totally jack up the next round with two huge dents, or it will eject the spent case and close without picking up the next round at all. It seems to do better with some M193 which should be higher pressure; and this rifle also does fine with the normal setting with suppressor.
So what I'm thinking is that the switchblock isn't giving enough gas back to cycle things properly. Has anyone else had the same problems?
The 12.5" has the same types of cycling problems, but they happen more often. In fact, it won't cycle wolf or silver bear at all in normal w/o the suppressor, and has trouble in suppressed mode with the suppressor. It's the same kind of bolt over-ride failure which will either totally jack up the next round with two huge dents, or it will eject the spent case and close without picking up the next round at all. It seems to do better with some M193 which should be higher pressure; and this rifle also does fine with the normal setting with suppressor.
So what I'm thinking is that the switchblock isn't giving enough gas back to cycle things properly. Has anyone else had the same problems?