I have a BCM bolt that has over 7K rounds on it with McFarland rings. My other bolt from a 12.5" has a few thousand through it.
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I have a BCM bolt that has over 7K rounds on it with McFarland rings. My other bolt from a 12.5" has a few thousand through it.
Owner/Instructor at Semper Paratus Arms
Facebook: https://www.facebook.com/SemperParatusArms/
Semper Paratus Arms AR15 Armorer Course http://www.semperparatusarms.com/cou...-registration/
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Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com
I have one AR (yeah-a cheap one) that ate gas rings. Install new rings and run a couple mags through it---there would be one ring FUBAR with pieces missing. Put a McFarland on it and zero problems since then.
After that, I put them in all my AR15's and will have it on my AR308 soon.
got my rings today and i was kind of nervous knowing how there have been alot of inconsistencies with their diameter, but the 4 i ordered from Grant all measure .502
I only had issues with inconsistent diameter rings from brownells. Grant's rings have always been perfect. I have them on all my bolts; 5 in my house alone. I only buy them from Grant. Stick with him and you will have no issues.
EDIT: I have given away almost ten rings to friends, also purchased from Grant, and they have all been in spec.
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Last edited by BufordTJustice; 05-08-12 at 18:01.
"That thing looks about as enjoyable as a bowl of exploding dicks." - Magic_Salad0892
"The body cannot go where the mind has not already been."
Little bit of a resurrection...
Installed a McFarland ring a couple months ago in a Noveske upper, it measured 0.5025" at the time and it was tight in the carrier. 884 rounds later I swapped out the standard carrier for a LMT Enhanced. Had about as much resistance as a slightly used set of standard rings. 870 rounds after that I pulled the BCG to wipe it down and the bolt fell right out of it. The bolt would drop right into the carrier and wobble around when I shook it. Seems a little odd after 1754 rounds, but the rifle was still running fine. The McFarlands were bought from DSG Arms.
Anyone else have one wear out this quick?
Owner/Instructor at Semper Paratus Arms
Facebook: https://www.facebook.com/SemperParatusArms/
Semper Paratus Arms AR15 Armorer Course http://www.semperparatusarms.com/cou...-registration/
M4C Misc. Training and Course Announcements- http://www.m4carbine.net/forumdisplay.php?f=141
Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com
I tried one of these in my rifle a while back. A DD upper, barrel, and BCG. The McFarland ring made it noticeably harder to slide the bolt into the carrier. I lubed the bolt with Frog Lube and took it to the range. I had multiple failures with the McFarland ring. I removed it and re-installed the original gas rings and the malfunctions stopped. I don't question that others have had good experience with them, but it didn't work out so well for me. If they have inconsistent dimensions from one ring to the next then I might have better luck with a different one, but I don't think I'll mess with it any more.
Steve
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