Help identifying a mystery picatinny rail section

[T-DOGG]

I'll apologize in advance, this is probably the stupidest thread I've ever started.

I bought a used rifle that had an M-Lok handguard on it with this section of rail installed. The rail section is not M-Lok and did not fit very well on the handguard at all.

My google-fu is very weak on this one and I can't seem to identify what brand it is and what it fits.

There are no markings anywhere and the locking system is a little unique as the tabs underneath don't rotate, they just draw up as you tighten the screws.

There is a curve to the mounting surface, so may assumption is that it fastens to a round handguard, presumably for an AR or similar.

Help! I'm going nuts.

 

[edwea]

https://www.midwayusa.com/product/2...ree-float-tube-handguard-ar-15-aluminum-black

These take a proprietary mounting system. Maybe for this?

 

[T-DOGG]

https://www.midwayusa.com/product/2...ree-float-tube-handguard-ar-15-aluminum-black

These take a proprietary mounting system. Maybe for this?

I had thought of those also, but they use a rail that attaches directly with screws into those threaded holes on the handguard.

 

[cmr13]

Maybe for a Troy rail section? https://troyind.com/sites/troyind.com/files/QARS_Installation - rail sections.pdf

 

[T-DOGG]

Maybe for a Troy rail section? https://troyind.com/sites/troyind.com/files/QARS_Installation - rail sections.pdf

Oh that is very close, but no cigar. Thanks!

*The tabs are indexable, so they can rotate to 4 different positions since the hole in the rail is square cut.