I own and love a mini, but the older models have a gas block and gas port flaw that results in lateral exhaust discharge if not perfectly fitted. It greatly impacts the weapon accuracy and requires a very skilled and knowledgable gunsmith to adjust it properly. I believe the newer models may have corrected this flaw, but the debate goes back and forth if the correction was very effective.
An M1A is a great weapon, but would not be effective in running battles due to loading issues.
Honestly, a milspec AR-15 really is your best budget rifle. You can always upgrade it over time if you choose very cheaply.
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