Are These For Triangular, Circle or Both Handguard Caps?

[arakboss]

Question in title? These are mid length handguards with a taper on the outside diameter.

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[Brian Vedack]

Those are for the round retainer only. The "universal" hand guards look like these...

 

[CamoDeafie]

Those are for the round retainer only. The "universal" hand guards look like these...

View attachment 2120211

Midlength tend to be only for triangle caps, with or without the extra tabs. I've never seen the tabs fit a round cap.

Magpul has some Midlength handguards and the SW M&P 10 carbine handguards that fits round caps. But the vast majority of clamshell handguards, and drop in quadrails and similar for Midlength, are for triangle caps.

 

[arakboss]

Those are for the round retainer only. The "universal" hand guards look like these...

View attachment 2120211

Which nubs would a triangular handguard ride on in the handguard in your photo?

 

[Member 55555]

They're not expensive; buy a couple of each and use the one that fits.
(This is NOT the last barrel you're going to "populate") ( I promise )

 

[arakboss]

They're not expensive; buy a couple of each and use the one that fits.
(This is NOT the last barrel you're going to "populate") ( I promise )

Only $128 each plus shipping.

BA, 16" 5.56 Gov, 4150 CMV w/FSB/CIRCLE Cap, Mid Length, 1:7, 1/2-28, QPQ

BA, 16" 5.56 Gov, 4150 CMV w/FSB/CIRCLE Cap, Mid Length, 1:7, 1/2-28, QPQ

www.schuylerarmsco.com

BA, 16" 5.56 Gov, 4150 CMV w/FSB/TRIANGLE Cap, Mid Length, 1:7, 1/2-28, QPQ

BA, 16" 5.56 Gov, 4150 CMV w/FSB/TRIANGLE Cap, Mid Length, 1:7, 1/2-28, QPQ

www.schuylerarmsco.com

 

[Member 55555]

Sorry.
From your original post I thought you just wanted to know which end-cap to buy.

 

[titsonritz]

Midlength tend to be only for triangle caps, with or without the extra tabs. I've never seen the tabs fit a round cap.

Magpul has some Midlength handguards and the SW M&P 10 carbine handguards that fits round caps. But the vast majority of clamshell handguards, and drop in quadrails and similar for Midlength, are for triangle caps.

Carbines typically use a round cap, rifles use triangle cap, mids use either.

 

[CamoDeafie]

Carbines typically use a round cap, rifles use triangle cap, mids use either.

Yea but I've never found a quadrail in stock for Midlength that uses round caps. All the A2 style Midlength handguards are triangle, except for S&W MP-10 handguards (round cap, no heat shields, for .308 carbines with same Midlength gas tube length)