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Model 1's kits are $400 dollars plus tax.
The biggest beef against them seems to be that they dont use chrome-lined barrels. I clean my guns and I live in Arizona with no plans to head for Cambodia soon so I should be alright[;)]
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Chrome-lined barrels will last longer, i.e. you can shot more rounds thru them, and they are a little easier to clean. I spoke with Bushmaster a few years back, and they have an AR that has shot 20,000 rounds and counting. I think without the chrome-lining, I have heard that barrels will last about 7,000 rounds. I have never been able to verify that figure. Maybe you can order a Bushmaster chrome-lined barrel, and sell your unlined one, or keep it as a spare.
Listen to The Snipers advice about those itty-bitty pins & springs, and assemble your toy on a clean work bench, and wear eye-protection, some of those springs are pretty powerful.
Have fun!