Hey! I don't know if this will help much, but on my Bar-10 I had a problem with a stiff bolt push. After opening her up and looking for the problem, I found that my spring guide stopper was rubbing against the cylinder, creating friction and little tiny metal shards that flew everywhere. I sanded the slot on the bottom of the cylinder to make it ever so slightly wider, and it fixed the problem right up.
Open her up and see if theres any sign of excess friction between the sears and the cylinder. Check on the outside of the cylinder to see if its rubbing there.
Just don't go sanding willy nilly without being sure.
Hope that helps.