Israeli Sayaret M4 SBS

[johnnywitt]

I've been trying to pull up the pictures of the Israeli SF short barreled M4. The one with the bbl shortened to about 12". Can anybody pull this up? I want to try and get one made on a Form 1 if I can find another M4 11707 for a good price.

[d]

I could not find it. but here is a picture of mine.

[MikeyZ]

Wow. Does the ARGO system work well with a barrel that short?

[d]

I have only used the short barrel with 00 and slugs and it works fine.

[johnnywitt]

I could not find it. but here is a picture of mine.

Well d, next question, who do I get to do the job that won't screw it up (I'm thinking Briley)??? Are you able to get 4 2 3/4" shells in the mag plus the carrier load? How is the muzzle blast? Would you do it again or would you stick with the 14" configuration so as to be able to go immediately back to the std. M4 with 18" bbl.
I'm thinking of finding a used 11707 and doing the Form 1 in the 12" or just buying the factory entry model in 14" so I don't have to mark the bbl. or receiver. If I do your Israeli 12" config., I think I'll just mark the barrel. I imagine that that gun is pretty handy around a vehicle.

[M4CQB]

I could not find it. but here is a picture of mine.

That looks awesome. I have a factory 14", but I am definitely looking to do a 12" down the road.

VERY NICE.

[d]

I purchesed a barrel from e-gunparts, and an extra spring. Following BATFE guideline, I registered the serial number of the receiver and marked the barrel with name and location of maker (me.) This negates the need to mark the receiver and also alows you to use the factory full tube (with 18" barrel and nine round capacity) without violating 922whtever (this is not a post about the legality of the "sporting arms law" so there is no need to discuss it here.) cutting the barrel can be done with a pipe cuter, hack saw or by a shop. e-gunparts also sells an aftermarket mag tube. This can be cut to length in the garage, but benelli uses a square threading that can not be reproduced in the average home shop (it is not threaded with a die but on a lathe with a jig and a multi-facted thread cutter.) After trimming the mag spring (trial and error, little at a time) I can load four 2.75 shells in the tube, one in the pipe and one on the carrier.
The blast is what you might expect but the kick is not bag (2.75 D.N. Rottwiels slugs one handed no prob)
My next project is to thread the exteriour end of the barrel (the wall thickness at 10.5" precludes internal threading....maybe check w/ briley) and attach a muzzel break/stand off device (like tromax or royal) with a stepped ring (or mag tube collar) that would index with the mag tube and be of length to allow the standard 14" mag tube to be used and retain the barrel in the receiver. This would transform the benelli m4 into a very compact sbs w/6 rnd cap. A sbs/ door breacher w/ 7rnd cap, and a combat scatter gun with 9rnd cap.
After that I will try to figure out how to attach it underneath my S.E. Crazyhorse. Then when I am board with that, maybe I will paint it or manufacture a sonic distance-responsive atomatic adjusting choke or something. I dunno, I also have to mow the lawn.

here is an attempt to replicate a factory looking VFG incorperating a pressure switch.


It needs some trim and finish, but I am pleased.

[UNSC_WARRIOR]

I purchesed a barrel from e-gunparts, and an extra spring. Following BATFE guideline, I registered the serial number of the receiver and marked the barrel with name and location of maker (me.) This negates the need to mark the receiver and also alows you to use the factory full tube (with 18" barrel and nine round capacity) without violating 922whtever (this is not a post about the legality of the "sporting arms law" so there is no need to discuss it here.) cutting the barrel can be done with a pipe cuter, hack saw or by a shop. e-gunparts also sells an aftermarket mag tube. This can be cut to length in the garage, but benelli uses a square threading that can not be reproduced in the average home shop (it is not threaded with a die but on a lathe with a jig and a multi-facted thread cutter.) After trimming the mag spring (trial and error, little at a time) I can load four 2.75 shells in the tube, one in the pipe and one on the carrier.
The blast is what you might expect but the kick is not bag (2.75 D.N. Rottwiels slugs one handed no prob)
My next project is to thread the exteriour end of the barrel (the wall thickness at 10.5" precludes internal threading....maybe check w/ briley) and attach a muzzel break/stand off device (like tromax or royal) with a stepped ring (or mag tube collar) that would index with the mag tube and be of length to allow the standard 14" mag tube to be used and retain the barrel in the receiver. This would transform the benelli m4 into a very compact sbs w/6 rnd cap. A sbs/ door breacher w/ 7rnd cap, and a combat scatter gun with 9rnd cap.
After that I will try to figure out how to attach it underneath my S.E. Crazyhorse. Then when I am board with that, maybe I will paint it or manufacture a sonic distance-responsive atomatic adjusting choke or something. I dunno, I also have to mow the lawn.

here is an attempt to replicate a factory looking VFG incorperating a pressure switch.


It needs some trim and finish, but I am pleased.

AWESOME!!!

[d]

i am reading over this again and I am sorry about thr spelling and mistypes. My left hand and right forearm are in casts or supports, and I am on advill.
regards,
d

[johnnywitt]

d, you Sir, are the Man!
Ok d, so when I get ready to do this. I'm gonna need some advice. I'm wondering if I will absolutely have to cut the recoil spring down (I'm thinking, stiffer spring= more positive feeding). I know the shells would probably be a hard to load though. Also, I need to know exactly how long to make the magazine tube including threads to make sure I get the full 4 rd.(2.75" ammo) capacity. Also exactly how long to make the barrel and any other tips that you would have done different were you to do this project again.

I think I'll have Briley do the work so I can have the barrel choked either with screw in (maybe a breacher choke tube, or fixed IC). I like a little choke in my shotguns although you don't really need it with the new Fed. Flight Control Wad ammo. Who knows how long that that ammo might be available though (I'm not talking about Obama, just that ammo comes and goes).
One other thing, do you see any issues with not having the barrel collar ring on the barrel. Even SBS or AOW have the barrel ring and I'm wondering if this puts undue stress on your weapon.