I read that the Vltor stock will only fit on mil spec tubes (not bushmaster, arma-lite, etc..), however that looks like it was placed on thier web site several years ago. Does anyone have any expierence installing the stock ONLY, no new tube from vltor, on a "newer" post ban bushmaster M4 type? The reason I ask is that I found the stock and all cheek adaptors for under $80 but the entire kit was $150.

Bushmaster receiver extension is not mil spec, it won't fit.

I actually tired this and I can confirm the Vltor stock will not fit a commercial tube.

Hi,  May I ask where you find one for $80?  Is it a new or used stock?  Thanks in advance