Mossberg 930 torture test

b007

930 这把枪买了大半年，只打过一次。买来后有清洗上油，然后去市内靶场，打了25发左后8号，7.5号，OO buckshot, 一点后没问题。后来就放着没动了。这次好不容易抽出时间来去飞碟场爽了一把。第一次打完有意没有擦枪。这次又打了150发。前125发没问题，到了最后的25发，开始出现FTE。大约4-5发一次FTE。FTE是extrator的钩子没能把hull给钩出来，打双发就会double feed。打单发的时候，bolt能退到底open，但弹壳还在chambler里，用手能轻易钩出来。总共150发就开始FTE还是有点不爽。既然bolt能退到底，就不应该是我打累了，抵肩不实。应该是extrator, chambler或者子弹的问题。

JayJay

我也是一样的问题，送去mossberg修，拿回来昨天去试，还是一样。

JayJay

如图

SW686Pro

這槍咱也有一桿, 二年多了，没用过几次，共打了二佰發左右，每次用後均清理上油。，清理多加油。庄状最初也曾有樓主照片上的卡彈, 後來仔细清理多加油。庄状

SW686Pro

更正 :＂庄状＂應為＂症状＂。多加油後症状逐渐消失。従来喜歡不起来这槍。故很少打。家防寜可用 S&W 686 Pro+

b007

JayJay 发表于 2014-6-23 09:37
如图

什么牌子的蛋蛋？

JayJay

b007 发表于 2014-6-23 16:05
什么牌子的蛋蛋？

winchester 7号 target load

b007

JayJay 发表于 2014-6-23 16:23
winchester 7号 target load

我用的是walmart的7.5号winchester universal.  

b007

网上看到的。

I finally decided to put the gun under the microscope to see where the problem lied.
I found that the chamber was rough as could be. I ran my finger around in it and I could feel the scratches and grooves in it. That's always a problem.

Also, I noticed that the extractor wasn't really grabbing the shells worth a crap. It seemed to not reach in toward the bolt face enough. I fixed that too. I had to remove the extractor from the bolt and file down a little area where the extractor met the bolt body. this allowed the extractor to reach in towards the center of the bolt face a little more, ensuring that it has a good bite into the shell casing. This also gives a slight bit more pressure on the shell pushing it to the left hand side of the gun during cycling ensuring good engagement on the ejector, that makes sure that it throws the old out with authority and gets it out of the way for the new cartridge instead of jamming like mine always did. The extractors seem to be like rough cast, or rough forged and that allows for alot of variance between production runs. Some may need help. Re hardened the steel and reassembled.

Lastly I noticed that there are two sets of gas rings in the gas piston. Each one has its own gap. Ensure that the gaps are opposite of each other, just like piston rings in an engine. This will reduce lost compression, or in the case of the shotgun lost gas pressure.

So, polish chamber, align gas rings and adjust the extractors attitude and you should be on your way to a happy gun.

SW686Pro

Only used Remington 12 ga, 2-3/4 lead slugger, 1oz. Thank for sharing the search result.

md2009

不知道跟半自动霰弹枪挑子弹有没有关系。我的930打Winchester low recoil target load有同样问题，但是打Remington buck shot 没有任何问题。要不要换换弹药再试试？