Dean Posted May 11, 2020 Report Share Posted May 11, 2020 Finally took out the mac 10 with Lage upper yesterday. The firing rate was erratic and I got a lot of blown out casings. I was using Federal 150 grain with the synthetic jacket. Could this cause the problems or is it the upper itself? Quote Link to comment Share on other sites More sharing options...
mike todd Posted May 11, 2020 Report Share Posted May 11, 2020 DEAN, next time you take that "mac" out be sure to have the original upper along. just in case. a quick switch back to the original upper and you would know if it was the ammo or the change. I try to have a good asst of my "proven" parts / mags/ ammo along anytime something new is tried. while the net can be a big help, there are just too many variables. its certainly better to use a "PROVEN" set or combination of parts . Quote Link to comment Share on other sites More sharing options...
Born loser...in Montana Posted May 12, 2020 Report Share Posted May 12, 2020 19 hours ago, Dean said: Could this cause the problems or is it the upper itself? Yes... all is possible. I take it one thing at a time. Ammo first! Quote Link to comment Share on other sites More sharing options...
Gaffshot Posted May 14, 2020 Report Share Posted May 14, 2020 Sounds like the ammo is reloads with too much powder. Not many other causes for blown casings. Quote Link to comment Share on other sites More sharing options...
mike todd Posted May 15, 2020 Report Share Posted May 15, 2020 GAFFSHOT, ammo is stated to be FEDERAL I would take that as a factory loads , many sub machine guns fire well b-4 a round is fully chambered. known as "preignition" its a necessary part of any blowback action and the cases will show the effect. when things go wrong and fire even sooner, it will be much more obvious as in this case. Quote Link to comment Share on other sites More sharing options...
Dean Posted May 15, 2020 Author Report Share Posted May 15, 2020 Called Lage and they guessed ammo because it was 150gr vs 115gr. Plus the synthetic bullet itself. Will try some round nose jacketed lead rounds. Quote Link to comment Share on other sites More sharing options...
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