I bought a Specter CST sling for my Bushy M4 and think I want to use a rear sling adapter instead of the nylon strap. Specter sells a "rear sling thing" for $34.05
And Brownells sells this one for $31.56 (one is for a 4-position stock, the other for a 6-position stock)
Any opinions on either one? Apples & oranges?