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I am guessing its just tolerance, though most airsoft bushing(SD for hi-Cap or Nova for 1911) I had/have all developed play eventually, the problem of steel bushing meets aluminum slide....
I quite like using SD barrel with or without their slide(actually I have no SD slide now that I think about it). Their out of box fit is very tight and needs fitting usually, but that works out to be tight locking barrel once fitted, and minimum play. Barring my open class Hi-Capa I have SD barrel in all my 1911/2011(2 straight with bushing in 1911s, and a hybrid in the SVI). They are about as good as you can get without going serious custom like Illusion Kinetic/ProG4....
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