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SVTPerformance's Chain of Restaurants
Road Side Pub
Panzer bullpup shotgun-need advice
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<blockquote data-quote="CV355" data-source="post: 16244542" data-attributes="member: 181885"><p>There is no real break-in on the magazine unless the edges are sharp or there is flash from injection molding. You can use a light file or die grinder to break the edges around the feed lips on the magazine. If there is interference, you can identify it with dykem or other machinist layout fluid or chalk. PMAGs always catch the bolt in my ARAK21, so I relieve the feed lip about 0.020".</p><p></p><p>As for stripping and entering battery, there's no harm in polishing a feed ramp. Test the loading cycle with some snap caps. Don't use live cartridges unless you're at the range with the barrel pointed down-range- lots of people do, but it doesn't take much of a slip up to blow a hole in your wall or head. Yeah yeah, snap caps aren't "true ammunition" with "true dimensions" but it's a starting point and I've found issues while using them. Make some blanks if you want by pulling primers, emptying powder and re-crimping. Problem with manual testing is that you don't get the same impulses from firing and re-chambering, but it's a start.</p><p></p><p>You mention a dent- check the extractor mechanism or detail. If it's too proud, that'll cause a FTE/FTL for sure. Feeding low brass though? Compare two cartridges- LB/HB. The differential in brass head height is likely where the problem is- that's only about 0.015". Doesn't take much to drag, but it seems the shorter head is clearing better. Could even be while it is stripping off- catching a burr?</p></blockquote><p></p>
[QUOTE="CV355, post: 16244542, member: 181885"] There is no real break-in on the magazine unless the edges are sharp or there is flash from injection molding. You can use a light file or die grinder to break the edges around the feed lips on the magazine. If there is interference, you can identify it with dykem or other machinist layout fluid or chalk. PMAGs always catch the bolt in my ARAK21, so I relieve the feed lip about 0.020". As for stripping and entering battery, there's no harm in polishing a feed ramp. Test the loading cycle with some snap caps. Don't use live cartridges unless you're at the range with the barrel pointed down-range- lots of people do, but it doesn't take much of a slip up to blow a hole in your wall or head. Yeah yeah, snap caps aren't "true ammunition" with "true dimensions" but it's a starting point and I've found issues while using them. Make some blanks if you want by pulling primers, emptying powder and re-crimping. Problem with manual testing is that you don't get the same impulses from firing and re-chambering, but it's a start. You mention a dent- check the extractor mechanism or detail. If it's too proud, that'll cause a FTE/FTL for sure. Feeding low brass though? Compare two cartridges- LB/HB. The differential in brass head height is likely where the problem is- that's only about 0.015". Doesn't take much to drag, but it seems the shorter head is clearing better. Could even be while it is stripping off- catching a burr? [/QUOTE]
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Panzer bullpup shotgun-need advice
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