CQBR

[Godlyspartan]

CQBR and Mk18 are not the same


CQBR were the older models that were used near the beginning of the war as seen in that Seal pic. Seals are the ones that majority use the LMT uppers which are 10.5 while the VBSS are the ones that use Colt 10.3 length barrels on their Mk18 mod 0
Mk18s were issued to replace the CQBRs by the navy, which used reburished M16A1 lowers with 10.3 length barrel. You can check out the Reburished Date on this Pic of an A1 Reciever


The Differance is Small between both rifles, but enough to be a weiny about with some people.
This is a CQBR


This is a MK18 mod 0

[Amazing KG3]

thanks for the title change!

[Godlyspartan]

BTW nice gat. Its still sexy.

[Amazing KG3]

Well it was hot until i broke it. I got to figure out whats going on now! I used to look at it in my case and whisper sweet nothings into the night, no i curse its very existence! ARghghgh >: (

[mitchie]

This may be a bit off topic, but does anyone know which inner-barrel length I need to use for a G&P CQBR front end?

Thanks.

[Nervikaire]

Should be around 285mm... That's what I intended to use in my 10,5''... (If someone can confirm, I have one for sale )

[oates76]

From what I could find, the best inner barrel is from the MC51.

[ppcsurfr]

I've been searching the Internet for more information about the Mk18 Mod0 carbines or CQBRs and stumbled upon this thread. While I still have to complete my own CQBR/Mk18 Mod0 project, I noticed that there seems to be an on going debate about how to complete an accurate CQB-R or Mk18 Mod0 Carbine.

I see some contradictory statements made by some and wish to point them out to get some clarification or confirmation about how I understand this whole thing to be.

Godlyspartan posted an image showing the CQBR (Close Quarter Battle Receiver) with an image of a MK18 Mod0 below it. It seems that it shows that both use the same barrel length which appears to be a 10.5" one.

Then there is also another image of a Mk18 Mod0 at the bottom of the same post which shows that it uses a 10.3" barrel which has the flash hider flush with the bayonet lug.

Does this mean that there are Mk18 Mod0s using either the 10.3" or 10.5" barrel?

From my understanding, the CQBR was offered as an upper only and once issued assemled from CRANE, it would be badged as a MK18 Mod0.

Anyway, that is something to think about since I too have been torn between getting a 10.5 inch barrel or a 10.3 inch barrel. Also, CQBRs and MK18 Mod0s use RIS instead of RAS which is not easily available for airsoft products. I've seen some images of G&P Mk18 Mod0 (special order only) kits which show a photo or two of MK18 Mod0s with RIS rather than RAS... you will notice the locking screw is at T1 of the RIS which is up at the front sight. The RAS uses even numbers and count forward from the upper receiver... and the fixing screw found at the receiver end of the RAS.

I'm slowly thinking of not really giving in to coming up with a clone instead of a short M4 by using either a 10.5 or 10.3 inch barrel, still complete with LMT rear sights, crane stock, wilcox aimpoint mount, but using an M4 lower and RAS.

I was going through some real-steel forums and they were discussing about how to come up with a Mk18 Mod0 clone... what some of the more experienced guys said was to simply get the LMT 10.5" upper and use a KAC RAS on it as in real life the RAS works better and is a tighter fit. The only reason the Navy uses the RIS is that it fits onto the varied barrel profiles which they've been working on from Colt and LMT.

Anyway, I hope someone can clarify the differences stated above... It's been bugging me so much as well.

Oh, by the way, I found this thread in warjunkies... it's about the thread I saw as well where one of the moderators is apparently a SEAL...

MK18 Mod0 thread

[Regan.S]

Wow 19 M4's....