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Old November 24th, 2016, 10:49 PM #1
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Why is it only AR bolts need to be MPI and HP tested?

Everyone says you MUST get an AR bolt that has been magnetic particle inspected and high pressure tested. Ok - so why don't other semi-auto rifles required the same? I never hear of an AK, or a FAL, or a SCAR 17, or a G3 requiring these tests on their bolts. Why is that??
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Old November 24th, 2016, 11:37 PM #2
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Must be lore or old wives tales. But then again I could be wrong.

I'm just tagging because this piqued my interest.
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Old November 24th, 2016, 11:55 PM #3
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It's part of the TDP for a mil spec rifle. To ensure the bolt is manufactured to specs and will be safe to use*.

The AK's, FAL's and G3's of the world may not require such stringent testing and proofing (although the G3 probably does)


*The MUST part is really perpetuated by those mil spec fanboys who masturbate over Matechs, carry handles, M855, and suffer from premature ejaculation when someone mentions Colt.

Post GWOT initiation and expiration of the Federal AWB the AR market has exploded with accesories and parts that fall into 3 categories, less than mil spec, equal to mil spec and better than milspec (application dependent)

Milspec is simply a STANDARD. It is up to the end user to determine what they need in a rifle.

Let's talk bolts. Bolts are made in batches and either not tested, batch tested or individually tested. Theoretically speaking if Company A makes them out of the same material and makes them the same way as Companies B and C there should be no issues providing there are no flaws in the raw material. Company A makes em doesn't test em just ships em out. Company B tests 5 out of every 100 made. Company C adheres to the milspec and tests every individual bolt. IF it where my money I would buy from company C for peace of mind.If I was given a rifle with a bolt from company B I wouldn't worry too much. If given a rifle with a bolt from Company A I'd probably send it to be tested if possible.

The most important thing is when you clean the gun to inspect the bolt for cracks, flaking, pitting, uneven wesr on the lugs, and discoloration EVERY time. Generally a good guideline is every 1k down the tube. Buy a spare bolt and enjoy life.
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Old November 25th, 2016, 12:12 AM #4
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Ok MOPAR - then based on what you just said, I would say the QC of the manufacturer is most important, and also that buying a bolt from a top notch company then is more important than a MILSPEC bolt from "Shit Guns R Us".

[EDIT - although I admit all of the top-notch companies seem to MPI/HPT their bolts]
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Old November 25th, 2016, 12:19 AM #5
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Quote:
Originally Posted by dreadpirate View Post
Ok MOPAR - then based on what you just said, I would say the QC of the manufacturer is most important, and also that buying a bolt from a top notch company then is more important than a MILSPEC bolt from "Shit Guns R Us".

[EDIT - although I admit all of the top-notch companies seem to MPI/HPT their bolts]
How are you using the weapon? Is it a wall hanger? Is it a plinker? Is it a shooting range queen? Is it a "hunting" rifle? Is it a home defense weapon? Is it your SHTF weapon?
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Old November 25th, 2016, 12:25 AM #6
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Quote:
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Ok MOPAR - then based on what you just said, I would say the QC of the manufacturer is most important, and also that buying a bolt from a top notch company then is more important than a MILSPEC bolt from "Shit Guns R Us".

[EDIT - although I admit all of the top-notch companies seem to MPI/HPT their bolts]
All the top knotch companies got that way through excellent QC and in house manufacturing. I won't buy an AR part from a company that doesn't offer in house pinned front sight assemblies and mil spec bolts/BCG's. Those two items are the KEY to a reliable AR. Any retard with a machine shop can buy barrels and assemble guns with set screw gas blocks, can cut teeth off a barrel nut, and thread a barrel with a tap and die set. But those two items require fixtures, templates, jigs and testing facilities and it's a fair shot that if they can hold QC on those two items and make a profit then the chances go up on everything else.
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Old November 25th, 2016, 12:36 AM #7
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How are you using the weapon? Is it a wall hanger? Is it a plinker? Is it a shooting range queen? Is it a "hunting" rifle? Is it a home defense weapon? Is it your SHTF weapon?
Good question. I would have a different attitude of I were a mercenary operating in some harsh corner of the globe. My (modern) firearms are mostly plinkers and hunters.
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Old November 25th, 2016, 12:40 AM #8
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Now I am wondering how many of my AR bolts are MPI/HPT. BCM bolts are; most (but not all) PSA bolts are; Remington (aka DPMS)??? Windham weaponry??? Anyways - all this has been very useful.
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Old November 25th, 2016, 12:45 AM #9
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IF Crap Guns are Us individually tested each bolt, then the consumers would be assured of getting at least a milspec bolt. The company might have a high internal rejection rate, but the ones that passed would be "milspec" .

If a high end boutique mfg with tight QC randomly picked a batch and didn't test them, they would have very high probability of being fine.

It would be in the middle, ie a company too new to have a track record, or has a so-so reputation, that does batch testing, where you would pause and make a decision.
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Old November 25th, 2016, 01:47 AM #10
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If you're not going to war buy what you can afford but PSAs MPI/HPT bolts are only a few bucks more than their non MPI/HPT ones. On my two builds I went with tested but that's just me.
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