Does the extension overhang the feed-ramps at all? I can't tell from the pic if that is just an illusion or if there a little overhang.
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Does the extension overhang the feed-ramps at all? I can't tell from the pic if that is just an illusion or if there a little overhang.
Last edited by midSCarolina; 04-28-17 at 10:54.
"The machine doesn't make the man, the man makes the machine" - Gucci
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Yes, the barrel extension overhangs the upper slightly.
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Yea... i don't know if it is just tolerances or if something is slightly off but you can either take it apart and check or just use some pmag m3s or something that will feed the round a little higher up on the feed ramp. If I had to guess, I would say it would run 100% with the m3 pmags.
"The machine doesn't make the man, the man makes the machine" - Gucci
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The intent of the rifle is potentially SD, so, I my opinion, it should work with with all quality mags and ammo. THis is what I'm striving for. Additionally, I haven't added the suppressor to the mix yet, as I expect a suppressor will complicate things more.Originally Posted by midSCarolina
Member
I definitely agree with that (not sure the suppressor would make it any better or worse) but you can either take it apart and try the barrel in a different receiver and see if it has the same issue and try to get the problem part replaced or if you are really good with a hand file, you can smooth out that junction yourself. Good luck
"The machine doesn't make the man, the man makes the machine" - Gucci
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Oh, I've already swapped upper receivers. Mega billet has been removed and replaced with a Sionics forged. The ramp fit is the opposite now, with he barrel extension slightly recessed in relation to the receiver. I'm hoping this will fix FTF problems. I'm not anxious to take a file or dremel to the feed ramps on the Mega receiver as I don't feel qualified to do that. I'd likely make it worse.
I'm hoping to test again in a few days.
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I think that should do it
"The machine doesn't make the man, the man makes the machine" - Gucci
Senior Member
That is gtg. Do NOT file them.
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"That thing looks about as enjoyable as a bowl of exploding dicks." - Magic_Salad0892
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I've actually tested the barrel in several uppers (Mega, Hodge, YHM and BCM), and all of them have a mismatch, albeit slight, between the barrel extension and receiver. The mismatch creates a small lip the barrel extension. I also tested another quality barrel I have, and that barrel's extension is smooth with the same uppers. There may be an issue with this barrels barrel extension. Per list rules, I have contacted the manufacturer. I will update when this is resolved.
NC
Last edited by nightchief; 05-02-17 at 17:08.
Senior Member
To be clear, a "mismatch" where the barrel extension's feed ramps are recessed further away than the aluminum receiver feed ramps is fine and within spec. There does not have to be a perfect alignment here. In fact, some companies err on the side of having the barrel extension purposefully be slightly recessed to prevent any negative geometries from occurring when tolerance stacks happen. The only issue is when the barrel extension's feed ramps extend further forward than the aluminum receiver's feed ramps, creating a ledge.
Absent that, there's no issue with that barrel.
"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."
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