Think I've found my first two, may do a rifle later as well.
First one, looks like it's got a removable tip, even if not I'll saw it off...
http://www.airsoftshogun.com/we-baby-hi-capa-38-v3-full-metal-gas-blowback-pistol-silver_oid308713.htm
Second, this one I'll have to either saw off or...