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Posted: 1/15/2017 3:09:39 PM EDT
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So I just put together my latest, no issues in assembling. I have a situation that I have not encountered yet though.
If I draw the CH rearward and release, the bolt locks up into battery . But if I ride the handle forward, then I have to physically lock the handle and seat the bcg using the FA.None of my other builds share this characteristic. The gas tube appears centered and I see no markings on it from impact. I have not lubed everything yet and am wondering if that is my issue. Any insight? Specs: all new parts F/K surplus A2 upper 14.5" Colt SOCOM bbl PSA premium bcg standard CH standard SS carbine gas tube standard GI bbl nut/delta RAS M4(not that it matters?) |
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ALL new parts? Break in. Had a new ARP nitride barrel and new nitride bcg hanging up for first 15 rounds. Fired ok, would not cycle. Brass was siezed in the chamber.
Had to put pressure on CH and bump butt stock for first 10 rounds..........then it got smoother. After 15 rounds no problems. Lube helps but new parts need a break in. |
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So lube seems to have helped some. Still, not like my others. Riding the handle causes the bcg to stop just short of battery.
FA to seat it, not gritty at all. Im gonna soak the bcg in some Mobil 1 overnight and run some rounds through it tomorrow. Unless our ice storm here is what they say it will be 
I am guessing new parts/tolerances is the "issue". Thanks for the input. |
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So, I have to withdraw my previous comment. Mine all close without issue when I ride the bolt forward. However, they're not new.
If you drop the bolt on a cartridge, does it drop into battery? If it doesn't, you obviously have something to look at. But, if it does, just get to the range and shoot it, and then worry later. |
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BE timing appears correct. Markings from contact/engagement are uniform on BE and bolt lugs.
Bcg locks into battery with a round. I have messed with it a bit, seems a little better. Im going to try a couple of other bcgs, see what happens. Another cleaning and heavy lube too. |
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Update: it's the bolt/bcg.
Tried 3 others, zero issues. This one does it in all my others. It's better with lube, and seems to be working in.Im gonna give it a few more reps to break it in and shoot it. I'm calling it new parts syndrome for now. Thanks to everyone for weighing in. |
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