M4 Research for R&D

[Guest cleefurd]

Benelli varies these (2) dim's on their M4 barrels, particularly on the entry length version.

 

A former 2112 (USMC Match Armorer now with the Army) asked me for input to compare with his rack M1014's, both full length and SBS-entry guns.

 

Anybody with a depth-mic (or that knows how to use the rat-tail on his calipers as a depth checker) please share these two dimensions.

 

Obviously there are no wrong answers, but any insight shared would mean a lot.

Thanks,

Kip

Edited October 29, 2010 by cleefurd

[Guest cleefurd]

BTT These dim's are reaaaaallllllly important.

 

Please help.

 

When the "what-where-why" becomes apparent the effort will be worth it.... honest.

[Guest cleefurd]

Rally cry ....

 

I'll provide a free premium M4 spring to the first 20 posts providing those dimensions, from stand-up forum members with 50 or more posts.

 

Kip

[xamoel]

could you provide a pic or something of what we have to measure?

i'll do it for free, it's just that my english isn't quite good enough to get what you're actually looking for.

[KB Fab]

I'll measure mine as soon as I get back to the house. No premium needed Kip.

[deltaopwong]

Here is what we measured at the shop..

 

Factory Entry barrel: I.D. - .720", O.D. - .915"

Factory 18.1 barrel: I.D. cylinder choke at muzzle - .704", I.D. cylinder choke before muzzle where it meets the barrel when screwed in about 2+ inches in - .735", O.D. - .930"

 

Hope that helps...

 

Stan

Edited October 30, 2010 by deltaopwong

[AggiePhil]

I speak English just fine and I don't understand what he's asking for. I have a caliper too.

[Guest cleefurd]

could you provide a pic or something of what we have to measure?

[Guest cleefurd]

Axial distance between the yellow surfaces

 

Edited October 30, 2010 by cleefurd

[i_wish]

 

On my 18.5" barrel, using my "el cheapo" set of calipers, I get:

Dim #1=.630

Dim #2=1.120

 

HTH

[Guest cleefurd]

Thanks "i wish".

PM sent

[TacticalKoala]

I don't think there is enough room there for a grenade launcher lug, in-spite of what skeeter wants.

[Guest cleefurd]

I don't think there is enough room there for a grenade launcher lug, in-spite of what skeeter wants.

sssssssshhhhhhhhhhhhhhhhh

[Guest cleefurd]

Might have something to do with this..... partly ;

 

[KB Fab]

Kip,

 

Dimension 1 = .616

 

Dimension 2 = 1.116

 

Both measurements were from my 11707 taken with my Starrett depth gauge so they should be pretty accurate. Hope it helps.

 

KB

[TacticalKoala]

Might have something to do with this..... partly ;

 

 

Another foreign made part on a Benelli!

[Guest cleefurd]

Another foreign made part on a Benelli!

 

Not on the parts list, and finish machined for us by yours truly here in the US:)

Edited October 30, 2010 by cleefurd

[TacticalKoala]

Not on the parts list, and finish machined for us by yours truly here in the US:)

 

Now if you could just make something for TOPS.

[AggiePhil]

I thought it might have to do with replacement irons.

[Duggan]

Working hard on those recoil reducers / 8th round extender combo unit huh?

 

I would get you dimensions, but I don't want to give you bad info ... in the middle of a move and all my stuff is packed up somewhere, if you still need it in a few days I can get you it.

[heckler&kochp2000]

18.5"

1st dimension .616

2nd dimension 1.116

Edited October 31, 2010 by heckler&kochp2000

[saym14]

i have to agree the orig post was not very clear.

[Guest cleefurd]

i have to agree the orig post was not very clear.

A screen capture was the only way to convey the inquiry, sorry about the low-res quality.

 

At any rate the feed-back is spot on:D. Great dimensions and priceless info.

 

Offer still stands. Dimensions welcome here !!!

[heckler&kochp2000]

How is the research turning out ?

[squawberryman]

Dim 1) .721

Dim 2) 1.185 sir