04-08-2013, 11:57 PM
(This post was last modified: 04-09-2013, 02:26 AM by Hank Rearden.)
Right on schedule UPS delivered the bolt carrier for what was to be the final piece of this puzzle. It wasn't that easy.
As several members here (LRRPF52 & Shivesy) suspected the gas port was a little undersized. Using an H2 buffer and factory Hornady 123amax it didn't have enough pressure to eject any of the first 8 rounds fired. As per the barrel manufactures instructions cleaning between each round.
After several private messages with LRRPF52 we decided to go with a standard carbine buffer & spring, and to also increase the gas port diameter to .094 ( 3/32 drill bit).
With these steps taken she is running very well. With the gas block only half open it is cycling reliably, the bolt locking back on an empty mag, and no sign of any damage to the brass.
Here are shots 13-22 taken in less than 1 minute at 75 yards. The flyer is a first round
clean bore with factory 123amax, The next 9 are 123gn Nostler custom comps over 26gn of TAC using a Federal match small rifle primer in new AA/lapua brass.
![[Image: image_zpsf0df2cd1.jpg]](http://i1295.photobucket.com/albums/b640/tbh1812/image_zpsf0df2cd1.jpg)
Seeing as this build is complete I'll close this thread by saying thanks again for all the help and information. I still owe rickOshay some info on the TAC loading. As soon as I run a ladder test and get out the Chrono I'll get them posted in the reloading area.
Thanks Again.
As several members here (LRRPF52 & Shivesy) suspected the gas port was a little undersized. Using an H2 buffer and factory Hornady 123amax it didn't have enough pressure to eject any of the first 8 rounds fired. As per the barrel manufactures instructions cleaning between each round.
After several private messages with LRRPF52 we decided to go with a standard carbine buffer & spring, and to also increase the gas port diameter to .094 ( 3/32 drill bit).
With these steps taken she is running very well. With the gas block only half open it is cycling reliably, the bolt locking back on an empty mag, and no sign of any damage to the brass.
Here are shots 13-22 taken in less than 1 minute at 75 yards. The flyer is a first round
clean bore with factory 123amax, The next 9 are 123gn Nostler custom comps over 26gn of TAC using a Federal match small rifle primer in new AA/lapua brass.
Seeing as this build is complete I'll close this thread by saying thanks again for all the help and information. I still owe rickOshay some info on the TAC loading. As soon as I run a ladder test and get out the Chrono I'll get them posted in the reloading area.
Thanks Again.