Originally Posted by gorknoids
Take a good look at the bore and the firing pin channel. If the firing pin moves freely and the bore doesn't look like the surface of the moon rolled into a tube, buy it. Or tell me where I can buy it. Same round with more muzzle velocity than an AK-47. As for fitting detachable mags, I have yet to find one which hasn't required an hour or more of filing and fitting to get it to run half-assed, let alone perfectly. Check your state and local laws for what can and cannot be on it, because that stuff varies greatly.
I have a cheapo aftermarket 30 round mag that is somewhat "removable".
If you hold the bolt open with your thumb and pull the mag release with your index finger, you can change mags within a few seconds. It's best to have an extended mag release.