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Posted: 4/14/2009 3:32:22 AM EDT
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I did a M&A M-4 build with a 16" barrel and standard Carbine buffer buffer. M&A supplied the BCG.The gun would have a faliure to extract every once in awhile and eject at 1- 2 oclock position which is discerning in my sight picture. I changed the Heavy carbine ( Black) extractor Spring with the standard "Blue" one and it runs 100% and ejects at 3-4 Oclock postion.
With this in mind I recently did another M-4 Build with a 14.5 barrel and a H buffer and a Bravo company BCG. Everybody told me to leave the Heavy spring that Bravo put in there alone. So I did and yesterday that gun ran 100% and Ejected at 3-4 oclock. The only two things that comes to mind is the Bravo BCG is a full auto one and It has the "Heavy Buffer" Compared to the standard carbine one. They both run 100% so I will probably not mess with anything, But I was wondering why the M&A wouldn't run with the extractor spring they supply? The Bravo BCG passes the head stand test and the M&A doesn't. But if held upside down the Bolt doesn't drop out of the carrier and Quib says this is O.K. I have another new Bravo BCG tucked away. Should I run that in the M&A or run the M&A BCG until it gives up the ghost? |
| M&A gun needs to get a new spring and buffer (Bushy has them in stock as of last week) and still if then the shells eject too much past 4 oclock, change the ejector spring back to prevent the bolt from 'catching' the spent shells.. BTW, is The M&A chrome lined, the chrome molly will also 'retard' ejection back to 2-3- oclock. ETA this is assumming that your using brass ammo, and that the ejector and exstactor are working, and that the bolt head is 'broken in' to that barrel extention |
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Both guns are now ejecting at about 3 oclock and 100%
M&A gun has a 16" barrel New build has a 14.5 barrel M&A gun as a regular BCG with the standard "Blue" Extractor spring New build has a Full atuo BCG with the heavy "Black" Extractor spring M&A has a standard Carbine buffer New build has a "H" buffer Both I assume have the regular standard buffer spring Both guns are relativly new bulds so no spring can be worn out yet. I probably shouldn't complain because both run 100% now. I'm just curios why the M&A gun would'n't run 100% with the Heavy extractor spring. I was wondering if the "H" buffer or the heavier full auto carrier plays a part in this? |
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