10.5 SBR AR15 question

[Artiz]

Secret ?? what are they doing to accomplish that ??

Interesting to know that 14.5" guns work well with mid-length, since the muzzle to gas port distance is short.

BCM has a 14.5" middy, and from what has been said on it at M4Carbine.net, it's the best thing since sliced bread.

 

[greentips]

We don't use suppressor or whatever, so whatever gas system works.

 

[chrisward3]

Specs please.

10.5" LMT Defender 2000
LMT 2-Stage Trigger
Magpul CTR
Magpul MIAD
Magpul ASAP
Magpul BAD Lever
KNS Pins
DPMS Ambi-Selector

Larue 9.0 FF rail
Eotech 512
Magpul MBUS
Magpul XTM Panels
Vltor Gas Block
Vltor G-Flashlight Mount
Surefire G2LED
Tangodown Stubby Grip
Noveske KX3 (not shown)

Magpul PMags & Ranger Plates

 

[greentips]

That said the C8SFW does run very very well with a carbine gas a 16" bbl.

Find this tibit in LWRC forum:

It is called a dutch chamber because when the Dutch adopted the C7 and C8 rifle from Diemaco, the C8's were plagued with functional issues and Diemaco had to come up with a solution or loose the entire contract.

They looked at a number of solutions and came up with a slight adjustment of the chamber dimensions. It is not really loose or tight. It has a generous freebore, slight difference in angle at the throat. All to optimize reliability. The ass end of the chamber is also slightly more generous.

Once we had the drawing, our reamer MFG said it was an Accuracy International chamber. Funny enough the chamber is also found in Wilson Combat rifles.

LWRC (the old company), got a contract to modify many diemaco C8 SFW's. We noticed they functioned reliably with much smaller gas ports meaning extraction was easier. The chamber was adopted on all LWRCI rifles manufacture starting in Cambridge MD with the Hammer Forged Barrels.

 

[furet]

So the chamber is neither a 5.56 or 223rem in the C8SFW, interesting.

 

[KevinB]

FYI I take was LWRC says with a grain of salt.
The C8 chamber difference was long before the Dutch contract IIRC, and one of the good things Gary Crocker was involved in.

LWRCI likes to claim they do all JTF-2's guns...

 

[greentips]

FYI I take was LWRC says with a grain of salt.
The C8 chamber difference was long before the Dutch contract IIRC, and one of the good things Gary Crocker was involved in.

LWRCI likes to claim they do all JTF-2's guns...

I bet Diemaco must be annoyed when they found out someone sent them a bunch of C8s to look at and monkey around, especially when they saw them being flogged around at SHOT.

 

[Leibermuster]

My 10.3 Stag with lots of Magpul goodness.......

Man i love that setup!