That C-clip coming loose CAN be a pain to maintain, but I doubt that its the cause of your gun not recocking.
That spring just helps the cocking rod to retract back into the gun body.
If you need a C-clip replacement, contact Ross at http://www.bosspaintballproducts.com
, he may have the part youre looking for.
The first thing you want to check, concerning the gun not recocking, is the guns internal lubrication.
The oil used should be a synthetic oil, or grease, namely Dow 33.
The hammer O-ring is the most important item to be lubed.
Anything other than synthetic oil will cause the O-rings to swell, causing major drag.
Second...what is the guns operating pressure according to the gauge?
It should read somewhere between 350-500 psi for starters.
Pressures too low, or too high, can cause recocking problems.
Check these 2 areas, and see if one of them may be the cause for your problem.