So I have been watching the builds on here recently, and getting serious gun envy... I have an M4 and an AR-15, but they are nice, and I don't want to cannibalize them to build another M4, so I decided to go radical and build a very short CQB focused M4 shorty... In effect, a modified NSWC Mk18 PDW.

I just finished my research and purchased all the parts. Here's what's arrived so far...


BCM BFH™ 11.5" Carbine Upper Receiver Group w/ Daniel Defense LITE 10" Handguard (NFA)



BCMGUNFIGHTER™ Charging Handle (5.56mm/.223) w/ Mod 3 (LARGE) Latch



BCM Bolt Carrier Group (MPI) - Auto (IONBOND Finish)



Magpul PMAG 30 Magazine FDE (FLAT DARK EARTH) with Maglevel Window (x10)




You would be surprised how much stuff is out of stock or backordered EVERYWHERE! It was very hard to find M855 62-grain 5.56 NATO. When I did, I had to pay about $.44 a round for it! I remember when I could get 5.56mm for less than $.20 a round.

Anyway, more stuff is on the way, and when it is assembled, I will post some pics of it. These are not my pics, as I am horrible at taking pics. For proof, here is my pic of the upper reciever... Horrible lighting, shadows all over, etc.






I'll post more pics as the build goes along...


-Skater

Oooh! Yummy Monolithic Toprail!

What Lower? Trigger? BUIS? Stock?

In Bloombergistan, do you have to keep the upper, lower, and mags locked in separate safes?

Bill, lets not talk about Bloombergistan... I think you can get arrested for even saying the word "gun" here.

BUIS will be the Magpul MBUS Front and Rear in FDE



Stock is the Magpul CTR (Mil)



Lower is from DPMS, with DPMS hardware...



Trigger is a Wilson Combat Single Stage Tactical Trigger Unit (TTU)




Some other goodies too...

-Skater

5.56x45 for $.20/round? I remember buying 7.62x51 for $140/case, shipped!

I'm not a big fan of M855 - out of my 16" it's going so slow that it crosses the 2700fps fragmentation threshold at about 90m, M193 gives me about another 50m. It's why my next AR's going to be a 20". But obviously in CQB you're more concerned with maneuverability and weapon retention than you are with fragmentation velocity. Looks like you've got a great build going on there, too bad it's not select-fire for even more fun!

No need for a tac-light.
The flash alone from that short a barrel should sufficiently light up any room you use it in.

Looks like that will be one badass home defense weapon!

Yep, that is what it is for... But I intend on getting one of those huge NovaTac flash supressors for CQB shorties that will curb the nuclear blast that comes out the front of these things.

-Skater

I am more concerned with KN at 60-100 feet. I currently have a 16" and a 20", and I am real happy with the performance of those with other round types. What round would you reccommend for a Mk18 type?

-Skater

Here is a copy of NSWC-Crane's presentation (UNCLASSIFIED) on the Mk18 CQBR.

http://www.dtic.mil/ndia/2003smallarms/john.ppt

-Skater

Based on the report, "Weapon B" was a lemon.