WTF KAK????
- Thread starter 232593
- Start date
Stick it in your dickhole and wiggle it around a bit maybe it'll polish up.
I intend to. Do you know what those markings on the face are. And on the tail it looks like they stopped the lathe short. Or is that supposed to be there.
You bought a bolt from a company that has made its entire business on ripping off Knight’s Armament products “KAK” instead of “KAC” and you’re surprised at quality issues?
No idea...but does not look like anything that would effect function.
1) Just send the bolt back to them...
2) Or run it, see how it runs.
3) Buy another bolt.
4) You could blend the radius and small step, done in a few minutes.
Them take the bolt apart and take .001" or .002" max, off the bolt face increasing the head space by that amount.
It'd still most likely be in print, but one should gauge it first to make sure.
5) Or a combination of the above.
lots of choices ...take your pick.
2) Or run it, see how it runs.
3) Buy another bolt.
4) You could blend the radius and small step, done in a few minutes.
Them take the bolt apart and take .001" or .002" max, off the bolt face increasing the head space by that amount.
It'd still most likely be in print, but one should gauge it first to make sure.
5) Or a combination of the above.
lots of choices ...take your pick.
Thank you.
Will option 2 result in Kentucky Ballistics shit with that odd ridge on the back of the bolt do you think? I ask because I’ve never seen that odd ridge on the tail of a bolt before.
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I have never seen that on the bolts tail.
It should "mike" .2503" plus or minus .002".
Most have been right on or less than .001" under nominal, even with wear.
If the under cut is too deep it could be out of print...or it was recut because it was originally oversize.
Measure it ...if it’s .250" blend into the radius without taking any significant metal off the .250" dia.
Or if you're not comfortable with that, buy a new bolt...save it for a backup emergency bolt.
On AR10s they don’t beat up the brass that bad.
Seekins uses them in their SP10s and the brass comes out looking phenomenal.
I plan on getting my first suppressor for one of the rifles I just had made so in anticipation of the high likelihood of my brass getting beat like Ike beat Tina I put a +2 gas system on the Bartlein barrel and figured I’d get the dual ejector BCG as well.
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I’m not trying to be funny, but when buying cheap shit, expect cheap shit. Looks like you got what you paid for.
Fair point, prior to this I didn’t know KAK was cheap shit. This particular BCG was more expensive than my BCMs and about the same as the Lantac I have.
Gotcha.
I should have looked to see the price before I commented. I didn’t know they were that expensive. Every time I e seen their stuff it’s been dirt cheap. If it cost more than a full priced BCM, I’d send it back and get a refund.
KAK has some good things, I've had good luck with their magnum bolts taking a full 65,000 psi magnum bolt gun pressures in a AR 10.
Carriers are made by a bunch of manufacturers...bolts are not.
All bolts come from those same few manufacturers....regardless of brand name the bolts are likely from the same vendor, cheap or expensive.
They are all the basically same.
You're getting the same 2 basic steels another less common was added, but they have the same heat treatment, per steel, and will all take the same pressure.
No one brand is better or stronger than the other on bolts...cause they are from the same few bolt manufacturers...and everyone buys from them.
Only a few special requests like champhers, or radius on the front of the bolt lugs are changed as per request or special finishes requested.
Carriers are made by a bunch of manufacturers...bolts are not.
All bolts come from those same few manufacturers....regardless of brand name the bolts are likely from the same vendor, cheap or expensive.
They are all the basically same.
You're getting the same 2 basic steels another less common was added, but they have the same heat treatment, per steel, and will all take the same pressure.
No one brand is better or stronger than the other on bolts...cause they are from the same few bolt manufacturers...and everyone buys from them.
Only a few special requests like champhers, or radius on the front of the bolt lugs are changed as per request or special finishes requested.
Is that a recess deformity right near the firing pin aperture? I can’t make out what that is.
Part of the PMCS and inspections of the AR-15/M16 dating back to the 1960s is inspecting the bolt face for pitting, cracks, or defects, especially around the firing pin aperture.
With sloppy gas gun chambers, the brass expands and impacts the bolt face, along with the primer. As the bolt rotates, any brass and primer material that fills in defects on the bolt face tend to shear off flakes of metal, which then accumulate on the bolt face, into the ejector channel, and into the extractor pocket-all of which are no bueno.
The defect on the bolt tail shouldn’t hurt anything, as long as the tail is the correct OD, and the aperture for it inside the carrier is the correct ID, and circular.
If I recall the thinking correctly, it was to reduce the reliance on a single ejector spring and extend the life of the ejector springs by distributing the workload of them.
On the standard AR-15/M16/M4, some very knowledgeable and highly-experienced guys recommended to change the ejector spring every 5000rds. These are people who shoot 500 round per day though, and have armorer support that changes out toasted barrels every 2 weeks. With the barrel change, they got new bolts with new springs, and new action springs as well.
Some of the companies who invest in high-speed photography have seen certain spent case exit behaviors that warrant dual ejectors for their approach, but this has often been more in different chamberings in both small and large frame ARs.
Another way to deal with it is to slightly enlarge the ejection port, which has been done on .50 Beowulf and some other unique chamberings.
I personally have experienced fairly boring reliability with Colt SP-1s, Sporter IIs, M16A1s, M16A2s, 1990s M4A1s, early 2000s M4s/M4A1s, and mostly TDP-compliant AR-15s dating back to the 1980s when chambered in 5.56, using correct parts. This was even true with the old black follower 30rd mags, as long as the BCG was lubed with CLP and the magazines weren’t damaged.
