cbrussell Posted September 29, 2019 Share Posted September 29, 2019 My friend has a Stag Arms lower receiver with a Rock River Arms 9mm upper. The fit is tight. He is having FTE with 115 Winchester White Box. We checked the extractor, seemed good tension. What should we be checking? Perhaps buffer/spring combination? Thanks for the help. Link to comment
Joe4d Posted September 29, 2019 Share Posted September 29, 2019 depends on what your "E" is extract or eject ? Link to comment
cbrussell Posted September 29, 2019 Author Share Posted September 29, 2019 Good point; failure to eject. Link to comment
AHI Posted September 30, 2019 Share Posted September 30, 2019 how is the ejector . bent /loose ? missing? Link to comment
cbrussell Posted September 30, 2019 Author Share Posted September 30, 2019 The ejector looks straight and tight. Link to comment
Les Snyder Posted September 30, 2019 Share Posted September 30, 2019 I'm not familiar with a Stag Arms ejector in particular... you might ink the inside edge with a marker and set it so there is a slight drag mark from the bolt....does a piece of brass lock in place when placed under the extractor, between the claw and edge of the bolt face? Link to comment
cbrussell Posted September 30, 2019 Author Share Posted September 30, 2019 We will try that “Les Synder.” We are wondering; what buffer spring combination are being using. Link to comment
AHI Posted October 1, 2019 Share Posted October 1, 2019 (edited) Is this a purpose built 9mm or a 223 converted to 9mm with an adapter of some type? other wise just one discussion on buffer systems there are more Edited October 1, 2019 by AHI Link to comment
Les Snyder Posted October 1, 2019 Share Posted October 1, 2019 CBRussell.... you will find a variety of springs and buffer weights being used for USPSA., depending on shooter perception... recoil reduction, or reduction of dot movement... I can live with recoil, if the dot doesn't move... power factor is naturally an important variable, and I would suggest you determine the power factor before you attempt to tune the carbine..... I use a rifle length buffer tube, and the extra length of the rifle buffer allowed me to initially play with a variety of different weight systems, that were inexpensive... I use a standard rifle length spring... I load only one 9mm on the Dillon, and it is a 135 Bayou coated using WSF.... 130pf out of the G17, and 146 out of the PCC (I'm giving up a bit) in a rifle length buffer filled with 7 1/2 lead shot... 6.0 oz 1/2" brass rod.. 6.2 oz 5/8" brass rod..7.0 oz filled solid lead.. 9.0oz I initially found the 7.0oz buffer to work best for my set up, but later switched to the current use of an Enidine hydraulic buffer (from my 5.56 rifle) and standard rifle spring with the modified Miculek comp I described in another topic, I get imperceptible dot movement with a double tap at 25yd Les L747 Link to comment
cbrussell Posted October 1, 2019 Author Share Posted October 1, 2019 Thanks "Les Snyder." He is currently shooting 115 grain Winchester White Box ammunition. We have not yet chronographed the load but I was reading a prior thread and most were using 124 grain bullets at a 130 - 135 power factor. Seems the suggestion when using a 115 grain bullet was to drop down a half pound on the spring weight. We will check your buffer/ spring combinations oot. Link to comment
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