mounting an M203....Help!!!

[norshon3]

I just spent some bucks (to me!) on an original LMT 40mm M203 and custom 37mm barrel to make it ATF legal w/o a DD transfer.....anyway I can't mount the sucker and am frustrated....Help....

okay here are the specs.

1) LMT 10.5" MK18 SBR upper.
pic. http://www.rainierarms.com/?page=sho...product_id=383
2) LMT M203 "standard model" ....
pic. http://www.autoweapons.com/photos07/nov/lmtgl.html

* It would seem the thickness of the barrel on the LMT upper, limits the ease of the 203' just snapping around the barrel. Should I be looking at taking the front sight off?

Hope this makes a bit of since.....

Ooops....I have a new flashider that has a 203' mounting bracket on the hider' itself.

[M4Guru]

There is a flat cut out on colt M4 heavy barrels for the M203 to slide around right before the barrel nut. I have not seen this on a MK18 since it is too short to mount a 203 on because the front bracket is out past the muzzle anyways. A different, rail mount 203 is available that can be made to work with some FF tubes. Or you can buy a stand alone stock for the model you have.

So, more importantly, once you get it around the barrel nut, what is a standard M203 gonna clamp onto at the front? The flash hider?

[sinister]

I gotta ask why?

AAI and LMT make the Pic rail Product Improved 203 that takes advantage of a free-float rail system.

[norshon3]

I am completely open to any and all suggestions / ideas....

I am not familiar with any new devices that allow easy mounting, so please feel free to make suggestions and point me to certain products related to the piece I have in hand.

I know LMT makes a new 203' that has the rail attached for easy mounting BUT as I already have the device in hand, I just want to make it work....

Thank you.

[erh]

Your simplest solution is gonna be to install a longer M4 profiled barrel..
The "Flat cut-out" as mentioned above are what you need, as well as the forward
mounting area which you presently will NOT have...

Good luck Sir..!

(Admittedly, I catch myself wondering why as well..?!?)

E!

[M4Guru]

As was said above, your upper and 203 are not compatible with one another. Here are the options:

1. Buy a new 203 with a rail mount and a FF tube to put it on. This will be really spendy all over again.

2. Buy a stand-alone adapter for the 203, therefore keeping your 10.5 upper and you can carry the 203 like an M79. This would by my preferred option since I hate the 203 with a passion and want to keep it off my gun.

3. Buy a 14.5" or 16" barrel/upper with 203 cuts.