Depends if you also have the upper handguard! Also are they for a Blade or Spike Bay? You cant interchange the blade or spike on these!
Ones for a Spiker seem to go for less and in unused cond with upper HG were going for $29 about 2 yrs ago, the ones for blade with upper Hguard were in unused cond. going for 49. about 2 yrs ago, but these are harder to find since the blade was used on these for about 2 yrs from 64 to 66!
Hope this helps!
3 yrs ago a dude had a crate of the Spiker Stocks at a show for $9.99!