Quoted:
I am inder the impression that a grenade launcher is NOT a DD, however the rounds are, ie. frag,HE. But there are flares for them and smoke grenades correct?[hail2]
Rob
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Here is the criteria that is used to determine if it is a DD. Per BATF
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Destructive device. (a) Any explosive, incendiary, or poison gas
(1) bomb,
(2) grenade,
(3) rocket having a propellant charge of more than 4 ounces,
(4) missile having an explosive or
incendiary charge of more than one-quarter ounce,
(5) mine, or
(6) device similar to any of the devices described in the preceding
paragraphs of this definition;
(b) any type of weapon (other than a
shotgun or a shotgun shell which is generally
recognized as particularly suitable for sporting purposes) by whatever
name known which will, or which may be readily converted to, expel a
projectile by the action of an explosive or other propellant, and which
has any barrel with a bore of more than one-half inch in diameter; and
(c) any combination of parts either designed or intended for use in
converting any device into any destructive device described in paragraph
(a) or (b) of this section and from which a destructive device may be
readily assembled.
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I think the part about "which may be readily converted to, expel a
projectile by the action of an explosive or other propellant, and which
has any barrel with a bore of more than one-half inch in diameter" covers the 40mm grenade launcher as being a DD (40mm = 1.57 inches). The internal diameter of the 37mm is 1.45 inches, but there are no exposive ammunitions readily available for it commmercially, only flares and smoke. Somewhat of a grayish area, though.
(again, from http://www.atf.treas.gov/regulations/27cfr178.htm)
On the issue of the 30 round mag vs a 20 or less, there is the issue of the practicality of storing, transporting and maintenance on a rifle with a long magazine permanently affixed mag extending below the mag well, the 20 might be tolerable, but if you have ever had to handle an SKS with 40 round fixed mag you know what I mean, could be a pain.
I suppose it would be trial and error.
Also there is the issue of the rivets internal to the mag body rubbing against mag follower, this may be remedied by dremelling out two divots in the follower to allow free movement over the rivet heads (since riveting the mag would allow for grinding down of old rivets, and replacing a damaged mag body with a new body, then re-riveting for permanent fixation). Also one could take out the mag catch spring and replace the mag release button with a nut of some sort, so the mag catch would be fixed, not spring loaded. There would have to be no doubt in the case of an audit that the mag was indeed incapable of being removed without gunsmithing - the whole point would be to be compliant with the letter of the law.