Most reliable BCG for Grendel pistol?

[Disciple]

I am looking for the most reliable BCG for an AR-15 pistol with a 10.5" 6.5 Grendel barrel, carbine length gas system, and A2 sight gas block. The YFS bolts on the Alexander Arms carrier concern me as I have read that these can be a point of failure. I have also read here of broken extractors so I would like to mitigate that potential. The LMT Enhanced Bolt Carrier sounds like it would help, if I can find one. Is it a good idea?

I want a complete BCG so that I can keep the AA one as a spare. If I get the LMT carrier I'll need to buy a bolt separately. The SixFive Mk136 bolts are out of stock and the JP EnhancedBolt is three times the price. Is the JP actually better?

The LMT/JP combination is the limit of what I can spend but it if will be meaningfully more reliable I am willing.

What do you recommend?

[A5BLASTER]

The bcg you have now will work just fine.

No need to spend more money on parts that won't and can't do any better then what you already have.

If you don't have a adjustable gas block on this gun, then get some tungsten weights for your buffer and adjust the buffer weight till your ejecting at the 3 to 3:30 area and the bcg will lock back after the last round.

Lapp the upper reciver to give a good square bolt lock up for bolt and extractor life.

[Disciple]

The YFS bolts are not worth concern? Are problems from those an urban legend?

I still want a spare BCG. I don't believe I can get another complete BCG from AA. If I get another AA bolt what do you suggest I put it in?

[A5BLASTER]

If by AA you mean Alexander arms, I wouldn't worrie about the gas key bolts at all AA doesn't produce are sell bad products. As too reports of broken bolts on the gas key, I have never experienced that happening and don't know anyone who has. But honestly never went looking for reports of it either. Two of my bcg's are from AA.

As too what to put a spare bolt in, I keep one in my day pack with my truck gun, my house defense gun and my hunting day packs.

If a bolt goes down, just swap it into your bcg and get the rifle back up and going.

[Disciple]

Yes, I meant Alexander Arms. You will find reports of broken YFS gas key bolts if you do go looking, but I don't know how much to trust those. BCM and other make a point of domestically sourced grade 8 bolts.

[Disciple]

Just one example, YFS bolts being described as "junky fasteners" by someone who seems to know his business.

https://www.youtube.com/watch?v=CrJl3LThLFw

[A5BLASTER]

Just one example, YFS bolts being described as "junky fasteners" by someone who seems to know his business.

https://www.youtube.com/watch?v=CrJl3LThLFw

Don't know. Never had a problem with any of the AA bcg's I have.

To be honest I'm more of a lowmass bcg guy, and run the rightobear lowmass bcg's. But my AA bcg's have a few thousand rounds on them each and no problems. Not anywhere's close to the round counts on my lowmass bcg's.

[FLshooter]

I have several toolcraft BCG.Never given me a problem.

[Growler]

[Disciple]

Growler, the LMT and JP are expensive but this will be my primary home defense, so if these are actually better and not just fancy marketing I am willing to pay. But since I don't have a suppressor perhaps the LMT is not appropriate? Bravo Company (BCM) and Daniel Defense do not appear to sell bare carriers and one of their complete BCG's would be at least as much as the LMT carrier. The JP carriers are also more expensive. I have seen the LMT carriers listed for $149 (but out of stock). Is there a less expensive "first tier" carrier to put a Grendel bolt into?

Perhaps I should wait for other options to appear as you said.

[Growler]

https://www.primaryarms.com/geissele-automatics-m4a1-bolt-carrier-group

[Disciple]

Growler, thank you for the advice. Now rather than upgrading I would like a second BCG as a backup, even if it's the same type. I will wait to see if the SixFive Mk136 bolts come back in stock as $55 is a great price. You seem to have had a mixed experience with LMT; would you still recommend them? With more searching I found a non-enhanced LMT carrier for $120; completed it would be about the same as the Geissele.

[Kswhitetails]

Any true Mil spec BCG, and a Group buy 65arms bolt. This doesn't need to be rocket science. Grendel works with the M4 pattern system. It takes a new barrel and bolt, and mags. Otherwise, leave it alone. It's not hard. Save yourself the troubles, and don't make it so.

[Disciple]

Yes, I'll wait for the SixFive Mk136 bolts to be restocked. Thank you.

[82HALO]

I also use right to bear arms light BC with never a problem with the group buy bolts!