07-20-2018, 07:48 PM
Also, if someone is saying that ".264 LBC" standard is .125", they are left having to explain why the originator of the .264 LBC-AR (the name for Les Baer's chamber) uses .136" Grendel bolts, and has done so before anyone else attempted to chamber in ".264 LBC".
Someone who seemed to have connections with BHW stated on AR15.com that they never have had problems with extractors breaking on the .125" bolts.
Right after that, one of their customers posted a picture of his broken extractor with the .125" face depth.
Even the guys running LMT enhanced AerMet 7.62x39 bolts were breaking extractors on the lobster tail extractor, and it was after 1200-1300 rounds. The LMT AerMet bolts are probably the toughest AR15 bolt for this case head diameter out there. There just isn't enough extractor lip to fit in the spaces and necessary mechanical articulation given the AR15 bolt dimensions, unless you take the face back and allow more lip material on the extractor.
What you'll see with 7.62x39 in terms of real stress testing is those who have registered machine-gun lowers that like to blast a lot of full auto.
They go through x39 bolts regularly, and pop in a new one when they break.
The LMT gave them the option to have a bolt that wouldn't shear lugs or snap at the cam pin hole, but alas...the extractor breaks.
Someone who seemed to have connections with BHW stated on AR15.com that they never have had problems with extractors breaking on the .125" bolts.
Right after that, one of their customers posted a picture of his broken extractor with the .125" face depth.
Even the guys running LMT enhanced AerMet 7.62x39 bolts were breaking extractors on the lobster tail extractor, and it was after 1200-1300 rounds. The LMT AerMet bolts are probably the toughest AR15 bolt for this case head diameter out there. There just isn't enough extractor lip to fit in the spaces and necessary mechanical articulation given the AR15 bolt dimensions, unless you take the face back and allow more lip material on the extractor.
What you'll see with 7.62x39 in terms of real stress testing is those who have registered machine-gun lowers that like to blast a lot of full auto.
They go through x39 bolts regularly, and pop in a new one when they break.
The LMT gave them the option to have a bolt that wouldn't shear lugs or snap at the cam pin hole, but alas...the extractor breaks.
NRA Basic, Pistol, Rifle, Shotgun, RSO
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com