07-02-2020, 06:37 PM (This post was last modified: 07-02-2020, 06:42 PM by mel.)
specs so far
custom 1-8T 28inch stainless hbar +2 gas system .936 at the gas block threaded 5/8-24
titan brake/qd adapter for the 7 inch titanium can
20inch slim mlok handguard
.936 micro gas block
Slick side rear charging billet reciver
Nightforce nxs 5.5-22 X 56 scope
Luth ar mba-1 buttstock ( may change )
not sure on bcg/buffer combo just yet , im going to try out a few of the options i already have on hand i may opt for a low mass bcg
for now its going on a dpms panther lower receiver till i find one i like
still on the hunt for the lightest trigger i can find
parts should start rolling in sometime next week ill post pics as they come in except for barrel thats 8-10 weeks out
im still trying to decide if i want a low mass bolt carrier or not or just spend the money elsewhere since i already have a few std bolt bolt carriers though i guess if it doesnt work well with this build i could throw it in my 20 inch rifle
mel Wrote:im still trying to decide if i want a low mass bolt carrier or not or just spend the money elsewhere since i already have a few std bolt bolt carriers though i guess if it doesnt work well with this build i could throw it in my 20 inch rifle
thoughts on a low mass carrier for this ?
If your not going to be useing a adjustable gas block, the low mass bcg is a waist of money.
though my thoughts are only worth exactly what you paid for them, i think the low mass bolt carriers only work well with an adjustable gas block. i think you want the chamber pressure to drop low enough for the brass to contract off of the chamber walls before you try and extract the case. With a low mass BCG, all else being equal, for the same gas volume & pressure, that extract cycle will start sooner. If too soon this might cause extractor failures, will likely be quite hard on the rims of your cases, and if you don't reload them, then you don't care how bad the cases get beat up I suppose. Also the BCG will have a lot faster cycle rate, unless you tune the gas down or change the buffer mass or other such things, and may be outside the design envelope for BCG cycle speed and may have the bolt going into battery before the round in the magazine get's pushed up to the feed lips of the magazine and your BCG fails to strip a round off the magazine because of too fast a cycle speed.
i think the low mass carriers were a request by the guys shooting the speed matches where fractions of a second in cycling might make a difference on the outcome of a match.
for normal use, I don't see a need for a low mass BCG, but if you have a tuneable gas system and want to give it a try, I don't see that it is a big deal either.
i would proffer that the $ would be better spent, particularly since you already have some bcg's, on more ammo or reloading components for more practice or more hunting. just my opinion though.
-tdbru
its an adjustable gas block i learned that leason when i started running a can lol , i may just stick with what i have for now and see how it does , this rifles going to be pretty dang heavy so it may not even make much of a difference i guess
sad part is it will prolly still weigh less then my ar-10 lol even with the monster of a barrel on it
Id imagine rifle + 2 will have more effect in avoiding early gas unlock while the case is still expanded than the difference between a full mass vs low mass carrier. The long gas system should have a smoother pressure curve. You should have a nice wide operating window to work in with an adjustable gas block.
mel Wrote:im still trying to decide if i want a low mass bolt carrier or not or just spend the money elsewhere since i already have a few std bolt bolt carriers though i guess if it doesnt work well with this build i could throw it in my 20 inch rifle
thoughts on a low mass carrier for this ?
I am working on another build, I have an AGB, and I am going to try a low(er) mass BCG.
welp they pushed back my shipping date on my billet upper again so i cancelled it , found another billet upper and just ordered that , hopefully ill have better luck on this one ,
07-13-2020, 02:11 AM (This post was last modified: 07-13-2020, 03:04 AM by mel.)
tdbru Wrote:Mel,
what's that in the 7/9 picture. kind of looks somewhat like, well, i'm not sure.
-tdbru
its a heat treated stainless baffle/tuned titanium stack for the can
edit
we just put 2 form 1 cans against an yhm resonator and all 3 cans were within 2 db on bolt and gas guns that tuned stack was the quietest by 1 db and a straight stack was only 1 db louder
its a dtt branded billet upper noy sure who actually makes it , but ive bought some dtt branded parts before and it was all decent stuff , worst case is its not that good and i can change it later when parts availability comes back , im sure i was lucky to find the one i did , infact right after i bought it it went out of stock on there site the next day so i either got the last one or close to the last one
![[Image: W4gSo8U.jpg]](https://i.imgur.com/W4gSo8U.jpg)
![[Image: wC05XLK.jpg]](https://i.imgur.com/wC05XLK.jpg)
