Most Japanese guns are weak and may break after limited use with propane. I hear about people using it in TM guns and having no problems sometimes, other times they get a broken slide or some other internal part.
Maruzen guns are especially plasticy and toyish internally, externally as well. If the Micro uzi is anything like their other SMG's, almost all internals will be plastic and will break after using propane a few times.
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