That's the one!
At least 1k thru both...with and w/o the can thru both carbines
"Violence, naked force, has settled more issues in history than has any other factor.”
― Robert A. Heinlein, Starship Troopers
Did some accuracy testing and re-chrono'd with the 12.5". Have 200rds on it now, velocity has settled. This thing is hauling ass. Not sure the midlength gas has anything to do with the velocity? Went up to 24.0/8208/77smk/2640 had slight ejector swipe. 23.7/2600 shoots very well. Will keep in mind it 45 degrees outside today. Things might change when hotter! Cycles great with the can, very soft shooting, port size is working out great. Throws brass in a nice pile at 3:30-4:00. Fun when things work out! Did try cycling w/o the can. One round in mag tried it three times. One the bolt locked back, other two did not eject the case. Hopefully next week shoot it at 4-500yds, see what magnification I need to spot misses/impacts on steel, go from there on a scope choice.
I ended up not using the Noveske NSR handgaurd. The .800 gas block just barely cleared the handgaurd. Put a little pressure on the handguard gas block will touch. Had a JP handgaurd laying around, plenty of room with it.
As mentioned above had two barrels cut from the same blank. Game time decision went with a 11.5" for the second barrel, .063 gas port, carbine +1 gas system for 100% suppressed. Put the barrel on a older Sun Devil upper. Same procedure as other barrel, heated up the barrel extension.... nice tight fit. It ain't coming off w/o heat.
Shot 200rds though it yesterday, red dot sight, 25yds. Functioned great with all the loads. Slightly snappier compared to the 12.5", not bad though. Chrono'd the last 15rds. Interesting the difference in velocity between the 11.5" and 12.5", about 70fps. Once again barrels cut from the same blank, all components the same.
23.7-2530 No pressure, a bit over gassed
I don't see that much change per inch of barrel for my longer barrels, but it does make sense that that MV change is greater as SBR lengths are compared. Good to hear that your barrels are working out nicely.
So....which barrel/upper do you like better?This message has been edited. Last edited by: fritz,
12.5", slightly smoother recoil pulse.
A friend gave me some MK262. Shot it through the 11.5". Stuff is scooting. No doubt these two barrels are on the fast side.
Swapped the grip to a Magpul K2+, puts my finger on the bang lever at a perfect 90.
2526 fps for a 77 grain in an 11.5" barrel is moving. That SD is uber impressive.
MVs for my 14.5" LWRC, with factory ammo:
2470 fps -- Hornady 75 HPBT match
2533 fps -- Hornady 75 HPBT Black
MVs for my new 14.5" Wilson Combat, with factory ammo:
2477 fps -- Hornady 75 HPBT match
2613 fps -- Hornady 75 HPBT Black
FWIW, that 2613 MV with Hornady 75 Black is comparable to the MV from my 16" barrels.
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