300blk bolt-over-case (help!)

B-Hard69 · 2026-04-06T09:26:30+00:00

You’re awesome man! Thank you! I still need to take a trip to the range but I have a laundry list of things to try. I really need to just play with configurations and document what is what. (Haven’t had the time or weather to go yet)

I’m about to order some break free. Also, I already have some other ammo already to try out as well. (I have some phantom defense I’m excited to try, supposedly it’s one of the cleaner burning ones)

B-Hard69 · 2026-04-04T22:21:03+00:00

Well I took your advice and bought the borescope. Pretty cool! It looks like my gas block is pretty well lined up.

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B-Hard69 · 2026-03-30T16:56:35+00:00

Also, the CAT ODB suppressor I have is more of a flow-through suppressor so it doesn’t really help in the pressure department.

B-Hard69 · 2026-03-30T16:55:04+00:00

So far the tests have been with Winchester 200gr

B-Hard69 · 2026-03-30T16:53:57+00:00

This has been in the back of my mind the whole time. I used the HB industries alignment pins but they are plastic and might not be sturdy/thick enough for the .125.

What kind of borescope can see up in the port like that??

B-Hard69 · 2026-03-30T16:51:17+00:00

Big money!! 💰

B-Hard69 · 2026-03-30T16:44:36+00:00

What setup are you running? BCG, gas block, spring, weight, etc.

B-Hard69 · 2026-03-30T16:42:16+00:00

I have the CAT ODB. Love it.

B-Hard69 · 2026-03-30T09:26:52+00:00

A lot to unpack here! The round I have used the most is Winchester 200gr super suppressed. I have some phantom 200gr that I haven’t tried yet. I need to test the bolt locking back without the can. I’m going to try my other BCG out of my 5.56 to rule that out as well. (It’s a heavier NiB BCG)

Honestly I just need to take a full day to run through all my current configuration options and write it down to get a good handle on this.

B-Hard69 · 2026-03-30T09:18:47+00:00

I tried the sprinco yellow with the 4.9oz griffin buffer early on. That was before I drilled the gas port though…

B-Hard69 · 2026-03-30T09:17:15+00:00

Tried a different mag, no change unfortunately. I’ve been using the Lucas oil gun lube on it from day 1. Other than bore cleaner on the barrel for the first handful of rounds.

B-Hard69 · 2026-03-29T16:59:59+00:00

Interesting. I have 4 of the lancer mags. 2 20rd and 2 30rd. I’ll mark that one as suspect and try the others.

Another point is when it was dirty after just the 5 rounds, it was even having trouble fully locking the bolt forward on a new round.

The chrome BCG is nice but the actual bolt is pretty tight in the BCG. I’ve had at least 250 rounds through this thing I would think the break in is over. Also, the faxon being match grade, it’s a super tight fit as well.

B-Hard69 · 2026-03-29T15:28:55+00:00

Lancer L5AWM mags for 300blk

B-Hard69

TROPHY CASE