Thats the same problem with just about any GBB(rifles too). So far my Guarder Steel TM Glock works ok(running on a 200% recoil spring that came with it, can shoot ~60+ round and locks back), but a glock slide simply doesn't weight that much, and its BBU volume and size is similar to that of a Hi-Capa. The USP slides are much bulkier...
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