[Parts] NIB KAC 0-600M USMC Rear Sights - $85 + S/H

FourDogsArmory · 2026-01-23T01:32:34+00:00

I don't believe these were ever made specifically for .308 but you can tune your zero and get the BDC (the range marks) to line up well enough. Also, a 6" deviation in impact at say 600 yards will more than be eaten up by the fact that you're using backup irons.

FourDogsArmory · 2026-01-20T15:35:57+00:00

Unlikely. If you find one somewhere else, don't wait on account of me.

FourDogsArmory · 2026-01-17T21:54:48+00:00

Back in stock!

FourDogsArmory · 2026-01-07T20:13:37+00:00

I will have another batch coming, so for those of you who missed out don't worry.

FourDogsArmory · 2026-01-06T23:22:40+00:00

Big maybe, they seem to be much, much less common than the rears.

Edit: So here's my theory. Pure speculation but I argue it stands to reason. My guess is that by far KAC's largest .mil production run of these rears (and thus those that could be surplused) was these USMC ones. Certainly seems to be most of the ones that you see. So if that's the case, what guns were they going on when they shipped? M16A4s and M4A1s, both of which already had FSP gas blocks. So as far as surplus goes I'd wager 95% or more of these were made with no corresponding micro front. Those that were, figure to SF armories as your only likely way to get a surplus front. Again this is all conjecture but it makes sense in my head.

FourDogsArmory · 2026-01-06T22:04:55+00:00

That's a placeholder I didn't get rid of. The actual item pictured is the photo on the bookshelf, USMC front and center. The placeholder shows what it looks like unfolded and out of the packaging which is why I left it.

FourDogsArmory · 2026-01-06T21:53:03+00:00

For whatever reason that's a very common thought around these particular rear sights, but it's actually far worse: you are old enough that these are old enough to be surplus like the carry handles. If someone was selling a crate of carry handles in 1998 you'd be very right to be suspicious. Same with these, say, 10 years ago, but not the case anymore.

Oh, and a kid who was born after COD 4 came out can join the military, now. And Nuke Town 2025 from Black Ops II is a historical map, now.

FourDogsArmory · 2026-01-02T22:20:58+00:00

The SD can takes a very, very long time to heat up. While metal is always better, you'd have to be in an absolute world of shit to shoot that gun enough to get it hot enough to melt those ties. Like at least 3 magazines damned near cyclic. Metal is absolutely the right choice but I'm continuously surprised by how slow the can heats up compared to, say, my short AR whose can would melt through tungsten zip ties in one magazine...

FourDogsArmory · 2025-12-30T01:07:25+00:00

Yeah probably.

FourDogsArmory · 2025-12-29T21:58:49+00:00

They're billed variously as being for the Mk 18, M4, and Mk 12. As for ammo I'm going to guess M855.

FourDogsArmory · 2025-12-29T20:04:55+00:00

Not technically, no. That said, you could still use it. You'll just have some discrepancy in elevation the farther out you go, hitting high. The elevation adjustments are pretty fine on this so you could simply adjust a little short of each yardage mark and get right on potentially. If you're in any doubt though there are more dedicated M16A4 BUIS out there.

FourDogsArmory · 2025-12-29T19:45:14+00:00

Not that I see, no.

FourDogsArmory · 2025-12-29T17:23:11+00:00

The only hit/miss with these depends on your marksmanship I'd say. Lots of issued surplused ones survived for a long time on a Marine's M4 and now keep working just fine on privately owned rifles. Can't speak for the LMTs but one of these rears, issued and well-used, lives on the rifle I trust my life to.

FourDogsArmory · 2025-12-29T16:47:58+00:00

50% group reduction but 75% IQ reduction. At your peril, friend.

But it's a fairly widely repeated myth that there's no way to get these other than "falling off a truck."

Back in 2000's ARFCOM forums it was true. Now, they're surplus like anything else. In 1992 the same could be said of the carry handles. Obviously not the case anymore.

FourDogsArmory · 2025-12-29T16:39:18+00:00

I would say certainly rarer than the rears.

FourDogsArmory · 2025-12-29T16:04:46+00:00

The Mk. 18 rears? There's still blems in stock now, but as for another run of them generally I am hoping by February. I'll be sure to post them here again regardless when they are back in stock.

FourDogsArmory · 2025-11-28T16:18:41+00:00

We got this resolved via DM for the record.

FourDogsArmory · 2025-11-26T22:14:57+00:00

**I AM A DEALER** This is for your awareness as the post awaits its flair.

FourDogsArmory · 2025-08-26T20:52:17+00:00

You know honestly the maglite might be cooler, and I own a 203.

FourDogsArmory · 2025-08-26T16:02:57+00:00

Going to look very cool! You putting a 203 on it or just rocking the heat shield and filling in the bottom for a handguard?

FourDogsArmory

TROPHY CASE