The 5 can likely be fed lead BBs as probably can the Beretta and M29 (Should take pellets too although is smooth bore) but that does rule out the RR, the AK and the 7 (although bios would burn into nothing well before the lead melts), had the Case arrive for the 5 today but won't be starting on it for a bit.
Rifles wise running is the Dual, Falcon, Supersport, 880, MP9 and B4, Record pistol and OG 25 I've still not fixed yet although I think I've got the parts for the 25 so that may change before then.
Also subject to change is what Guns I have as I've a fair few on my wanted list so more may be added in time.