Well got to test fire the newest old gun Dad haggled around for. It's an old Bushmaster M4 with A1 Upper. Not a bad lil shooting KISS carbine. It shot really good for the informal shooting I was doing and then it happened. THE JAM! Seems one of the 55 grainers got pushed into the case as it was trying to cycle and the case mouth hung on the feed ramps. Good thing too because it was pushed all the way in. Just another reminder to check your ammo when you load your mags. This was ammo that I have had for a long time in my rainy day fund.