The ReTro valve & lvl10 are a beautiful combination. Add an Intelliframe & you'll be in pig heaven. Insane rates of fire w/no ball breaks. What more could you ask for? 
btw - the ReTro valve and AIR valve do not have interchangable parts (other than maybe a couple o-rings). Check out the diagrams on http://www.airgun.com/manual.shtml.
btw - the ReTro valve and AIR valve do not have interchangable parts (other than maybe a couple o-rings). Check out the diagrams on http://www.airgun.com/manual.shtml.
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