this post was submitted on 21 Jan 2026
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LMT Mars-L Lower, LMT 9.25" MRP upper, LMT 10.5" 300BLK Barrel, Geissele SSA-E (3.5lb), magpul furniture, EOTECH G43/EXPS3, Vltor A5 buffer, Radian Raptor Charging Handle, Bootleg adjustable BCG, Sandman-X can., POS Hexmag (need to swap this out)

This is my first post to this community. I didn't realize the community was here... but generally speaking, Lemmy needs more posts, so I'm putting this here in an attempt to do my part.

Last year, I was thinking about upgrading my Ruger 8515 to something a bit higher end and ultimately decided it would be better to build one from the ground up... did a lot of research, saved a lot of money, waited a lot of months and came out with this thing. Got the Form 1 stamp back yesterday.

It's pretty nice, but it's a slight bit heavy for an SBR @ 10lbs (loaded and with the can). I like it though. It's more difficult to shoot than the 8515, but I've only taken it out once so far (last night), so I still have some "getting used to it." There's also a light and an extension for said light on the way here now, so by this weekend I think it'll be "done done."

It's completely solid w/o the can using 150gr Federal. Once I put the can on it and switched to subsonic ammo (Hornady Black 208gr), I had failure to feed after the first round. My assumption is that my buffer weight is too heavy (currently on A5H2 that came with the Vltor kit) so I have an A5H0 on the way here now. Fingers crossed I'm right. It's whisper quiet, and if I can get it consistent, I'll be in love with this thing.

I only have a handful of friends that are into this hobby, and I don't want to send them pictures or let them know it's done. I'd rather whip it out as a surprise at the next range day.

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[–] papalonian@lemmy.world 1 points 9 hours ago (2 children)

OP has corrected me on this setup (and I embarrassed myself by linking supporting material to their claim), but the two that I've used (one is my own) has the magnifier second. I think it really just depends on the magnifier. My magnifier is long enough that, if you were to flip it to the side and rest your cheek before it, the optic would be way too far to be able to use

[–] frog_brawler@lemmy.world 1 points 59 minutes ago

I think you might benefit from switching positioning, re-zeroing, and checking out how much better things will work if your magnifier is closest to your eye.

I’ve got 3 different mag/dot combos. They all need the magnifier closer to the eye vs the dot.

I may be wrong, but I’ve not personally encountered an example that makes me incorrect.

[–] setsneedtofeed@lemmy.world 2 points 5 hours ago* (last edited 5 hours ago) (1 children)

My magnifier is long enough that, if you were to flip it to the side and rest your cheek before it, the optic would be way too far to be able to use

I'm now genuinely curious what magnifier you have. I've never seen a sideflip long eye relief one.

I have a friend who put his magnifier on his handguard and didn't realize anything was wrong with looking through the magnified pinhole until I corrected him.

edit:

the optic would be way too far [away] to be able to use

What are you magnifying?

[–] frog_brawler@lemmy.world 1 points 57 minutes ago

Concur, but I also recognize that I haven’t used everything. I’d be impressed if we’re both incorrect but I suspect we’re not.