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Member
Some ARs advertise the barrel is high pressure tested (HPT) and magnetic particle inspected (MPI). IIRC, some advertise those same tests for the bolt carrier group and the bolt within the group.
Do performing these test give any benefit? If these tests are performed, do they weed out anything that would have led to a much shorter service life or the risk of catastrophic failure somewhere along the line?
Senior Member
They weed out any material defects. Like you say... a barrel could burst if a crack in the steel wasn't identified. Maybe lysander can shed more intimate light on the rejection rate and such.Originally Posted by shadowspirit
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
Senior Member
It's part of mil spec to keep parts suppliers honest, not required by a good company who tightly controls their raw materials. Knights Armament does not do HPT and IIRC has stated it cuts bolt life in half, they also warrant their bolts for +20,000 rounds.
“The Trump Doctrine is ‘We’re America, Bitch.’ That’s the Trump Doctrine.”
"He is free to evade reality, he is free to unfocus his mind and stumble blindly down any road he pleases, but not free to avoid the abyss he refuses to see."
Senior Member
American Mediocrity and Contracts awarded to minorities! I remember this crap in the 90s with Sanchez and Coopers mags. As I understand it they would give the magazine tooling to various brown people so they could make money screwing up the military's magazines. American stupidity at its finest.
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
Member
Dude are you being serious? Calling minority workers mediocre? Saying brown people screwed up military mags? Damn you are one Racist POS. I can’t believe nobody call that out. Damn.
Hunter of Gunmen 8541
Member
Good catch.
"We all got it comin"....Will Munny
Senior Member
Are you being serious? In case you are, No. I'm not calling all non white/minorities mediocre workers. The practice of awarding contracts to incompetent people because the color of their skin is what I have issue with.
Shit. That idiot who had the mag company "Cprod" was, I assume, a white guy. And he put total garbage out on the market.
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
Senior Member
I think you have it backwards. Hes calling mediocre workers mediocre. They got the contract due to racism. I dont know the details he's talking about, but its industry standard at this point( DEI)
Senior Member
There is only one place in the world to get Carpenter 158 steel - Carpenter Technologies Inc. I do not know how much tighter you can get on your raw materials . . .
Yet, many good companied feel that there is value added to HPT/MPI their bolts, and still manage to price them competitively at $60 - $80, only $10 to $20 more than the non-HPT/MPI bolts.
". . . penny-wise, pound foolish . . ."
Member
HPT absolutely shortens the life of the bolt, and this was explicitly covered in a NDIA briefing.
What it does get you is assurance it will work out of the box, at the cost longevity. Probably a good idea if you want to be able to spit out a TDP to any vendor and have confidence in a QA/QC process.
You will see bolts for GPF contracts maintain the legacy HP/MPI and some to other units not specify this.
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