14.5" build question

[jron]

I am building a 14.5" upper with a mid length gas system. from online stores they say that you need to use the triangle end cap with the specs I have vs. the round end cap.

Whats the differences with the caps? seems like a simple piece of metal I know they have different diameters and need the right diameter.

I am going to run a magpul moe mid length handguard, was not sure how that would match up with the triangle end cap.

anyone have some insight on this?

Thanks.

 

[noxin]

There is no difference for the gas system regarding the caps.

The caps are dictated by which handguard you are using. If it needs a triangle vs a round, you'll know.

 

[jron]

There is no difference for the gas system regarding the caps.

The caps are dictated by which handguard you are using. If it needs a triangle vs a round, you'll know.

Ok cool. I was sitting here thinking the magpul hanguard wouldnt work with the triangle cap.

Weird the sites say mid lengths "need a triangle cap"

 

[headednorth]

Yep, ask me how I know.

 

[noxin]

I haven't seen that, but I'm going to free float my mid-length, and I'm doing a 16 or 18" barrel on that build.

 

[LoginName]

Hmmm... I have mid-length Magpul hand guards on one of my AR's and I installed a round end cap with no problem.

I'm not 100% certain, but I think (so, don't quote me on this), you might be able to install either one.

Simple solution... get both and see what works.

They're inexpensive parts, and what doesn't work you can throw in your spare parts bin, or karma out.

ETA: From Brownells...

Two-piece, snap-on design—no gunsmithing—fits rifles equipped with Delta ring and round or triangular handguard cap.

http://www.brownells.com/rifle-part...oe-handguard-prod27484.aspx?avs|Color_1=Black

And Midway USA...

Easy to install utilizing existing delta ring and round or triangular front handguard retaining cap

http://www.midwayusa.com/product/2319238829/magpul-moe-handguard-ar-15

 

[groundscrapers]

I would think its because of the availability of handguards that interface with them. Midlength might be an oddball size.

 

[Gillham]

Magpul's handguards AFAIK are molded to accept both. At least the carbine length one is. IIRC the Midlength one is as well.

 

[KMM696]

You're fine with that setup.

http://store.magpul.com/product/MAG418/184

If you look under the "Specs" tab, you'll find:

Easy to install utilizing existing delta ring and round or triangular front hand guard retaining cap

Just pulled mine out to look (Midlength 16"), and mine's triangular, which was a slight surprise. Wasn't the triangular cap from the M16A1, and the round came out with the M16A2?

 

[Gillham]

Just double checked the magpul midlength guard. It's molded/cut out for both round and triangle handguard caps.

 

[jron]

thanks for the help guys! now to order some parts