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Posted: 10/9/2004 1:01:05 PM EDT
I've got a Colt 6400C M4 carbine with the ARMS SIR slimline foregrip. I purchased a tango down Vertical Grip and can't seem to get it to mount properly on the SIR rail on the bottom of the foregrip. I was curious if anyone else has used this combination and if so what the key to properly installing it is.

Link Posted: 10/10/2004 9:54:46 AM EDT
The TD grip doesn't fit the bottom rail on the SIR. There was somebody making an adaptor for it, but they don't do it anymore. There is or was a post in one of the other forums about this, and a workaround. I'll see if I can find it.
Link Posted: 10/10/2004 12:27:21 PM EDT
TD was the one making the rail, I got one for my SIR 58. Contact Chen Lee @ CL Tactical as he said he may have one or two left I think.

Link Posted: 10/11/2004 4:26:15 PM EDT
Put it in a vise and hit the top with a bastard file. Also hit the inner rail at the top. Take it slow. Eventually it will fit nicely.
Link Posted: 10/11/2004 5:24:34 PM EDT
Bevel the channel in the grip with a Dremel until it will fit the rail without rubbing. Take it slowly.
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