The carbine is way "handier", but for sniping at FAC levels the efficiency and air capacity of the rifle is a big advantage. The Rifle is seriously LONG though !

Trouble with FAC airguns is they sell for less than their 12FP equivalents, so your conversion will effectively cost you the 100 quid, plus say 75 quid "depreciation".

If you can find an FAC career secondhand, this will save you a bomb - just sell your 12FP one.

Last point, 100 quid seems a bit steep to be honest (knowing exactly what's required) - who are you using ? I would have thought RangeRight could come up with something better value - (and their gunsmith is very good on Careers <img src="http://jsramsbottom.co.uk/bbs/e/icon_wink.gif" alt="Wink" width="15" height="15"><!--graemlin:--> )

HTH - JB