Quoted:
I'm green to AR's, and I've seen pre=ban collapsible stocks for sale in commercial catalogs with no disclaimers as to whether or not they can be put on a post-ban rifle. I would like the ability to change the length of pull for summer/winter, girlfriend shooting, etc, but of course I don't want to do anything illegal. I'm assuming you can't...but we can use pre-ban mags, so I thought, eh maybe. Thanks.
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If the receiver is a post ban, it cannot be a semiautomatic assault rifle. Here is how the BATF defines "semiautomatic assault rifle":
[red]a semiautomatic rifle that has an ability to accept a detachable magazine and has at least 2 of -
(i) a folding or telescopic stock;
(ii) a pistol grip that protrudes conspicuously beneath the action of the weapon;
(iii) a bayonet mount;
(iv) a flash suppressor or threaded barrel designed to accommodate a flash suppressor; and
(v) a grenade launcher*[/red]
SOURCE: [red][url]http://www.atf.gov/firearms/legal/semi.htm[/url][/red]
[red]*[/red]In section {v} they are referring to the ability of a rifle grenade to fit over the muzzle and be fired.
So you see you can have only one of the features, two or more makes it illegal if it is a postban.
In addition, it would appear that Virginia has specific laws concerning so-called "assault weapons" that are more restrictive than the federal laws:
[red]Virginia Code § 18.2-308.2:2(G) defines "assault firearms" as:
Any semi-automatic center-fire rifle or pistol which expels a projectile by action of an explosion and is equipped at the time of the offense with a magazine which will hold more than twenty rounds of ammunition or [is] designed by the manufacturer to accommodate a silencer or [is] equipped with a folding stock.
[/red]
SOURCE: [url]http://www.firearmslawcenter.org/content/virginia.asp#assaultweapons[/url]
This would appear to restrict magazine capacity to 20 rounds in Virginia. You may want to research the Virginia state codes to ensure you stay within the realm of the law.