HPT and MPI testing. Why?

[lysander]

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.

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 . . ."

[NoVA5326]

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.

[lysander]

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.

Which NDIA Brief?

Please link.

[alvincullumyork]

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.

I thought knights batch HPT their barrels and bolts. They would take certain percentage of a lot and test those and then throw them away.

[james23]

It's all about making sure everything's in top shape and reducing the chances of any nasty surprises popping up later on. Trust me, it's worth it for the extra peace of mind knowing your gear's solid.

[shadowspirit]

It's all about making sure everything's in top shape and reducing the chances of any nasty surprises popping up later on. Trust me, it's worth it for the extra peace of mind knowing your gear's solid.

Yes..