Black River Tactical
BRT OPTIMUM Hammer Forged Chrome Lined Barrels - 11.5", 12.5", 14.5", 16"
BRT EZTUNE Preset Gas Tubes - PISTOL, CAR, MID, RIFLE
BRT Bolt Carrier Groups M4A1, M16 CHROME
BRT Covert Comps 5.56, 6X, 7.62
My first AR was a oly arms car15 bought it in 1994. Shot about 1000rds through it in one day until it began having failure to feed and extraction issues. I had no idea i needed to oil the bcg.
Went back to shooting my Mak 90s.
I tried to follow the science but it simply was not there. I then followed the money, thats where i found the science.
To continue beating the dead horse, this rifle functioned normally when oiled with all (brass case) factory .223 and 5.56 I tried, plus some mild-ish reloads. Functioned normally meaning ejection direction and distance similar to my 16" mid and optimum gassed ARs, last round bolt hold open, etc.
When I took it to the range without lube after a thorough cleaning, it functioned normally until I changed to some Hornady 55 gr soft point 223 and the bolt consistently failed to return to battery with a live round about 1/2 out of the magazine.
I messed around for a couple rounds, tried a different magazine with no change, then swapped to another gun. The second rifle fired the remaining 10 rounds or so of that ammunition without issue.
Maybe the ammo was a little weak, I don't know. I do know that I will put an oil bottle back in my range bag.
Andy
Forward Ascertainment Group
Sure, M855 military ammo has a gas port pressure requirement that I’ve seen, they do that to ensure function.
PMC used the wrong powder in their Bronze M193 back in 2000 something. Ran fine in carbines, choked hard in rifles.
https://www.m4carbine.net/showthread...C-ammo-problem
Hornady Superformance is basically the opposite. Look at the pressure curve chart they have where the pressure goes up faster, a regular faster powder would also go up faster but then drop off faster after the peak. So it could have similar velocity (area under the curve) as the standard load but lower pressure at port.
https://www.hornady.com/support/supe...rated-firearms
Understood. Thank you.
I've used Superformance for several years now (55gr 5.56 GMX) in my 16" intermediate and 11.5" suppressed SBR. Idefinitely moved up one buffer weight compared to nato pressure 55gr.
Pressure under the curve. Interesting.
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"That thing looks about as enjoyable as a bowl of exploding dicks." - Magic_Salad0892
"The body cannot go where the mind has not already been."
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