I have an adjustable gas block. I typically reload 100 grain bullets or less and had switched to a h3 buffer with those. Im thinking I was over gassed trying to get the heavy buffer to lock back with the 123s maybe causing the swipes. Im hoping with the jp buffer and springs I can retune the gas block and clear some of the swipes up.
Here are my chrono results with the gas block closed.
Arcomp:
25.6-2120fps
25.8-2145fps
26-2167fps
26.2-2185fps
26.4-2200fps
26.6-2220fps
26.8-2229fps
27-2255fps
27.2-2262fps
27.4-2275fps
27.6-2276fps
27.8-2299fps
28-2314fps
8208xbr
26.7-2107fps
26.9-2174fps
27.1-2181fps
27.3-2198fps
27.5-2207fps
27.7-2256fps
27.9-2276fps
28.1-2273fps
28.3-2317fps
28.5-2315fps
Hornady brass cci 450 primers 2.25 oal .020 off the lands.
Here are my chrono results with the gas block closed.
Arcomp:
25.6-2120fps
25.8-2145fps
26-2167fps
26.2-2185fps
26.4-2200fps
26.6-2220fps
26.8-2229fps
27-2255fps
27.2-2262fps
27.4-2275fps
27.6-2276fps
27.8-2299fps
28-2314fps
8208xbr
26.7-2107fps
26.9-2174fps
27.1-2181fps
27.3-2198fps
27.5-2207fps
27.7-2256fps
27.9-2276fps
28.1-2273fps
28.3-2317fps
28.5-2315fps
Hornady brass cci 450 primers 2.25 oal .020 off the lands.