Any progress on the modification? I'm quite interested in this.
A few links that I've found on factory products
As mentioned above, Fulton. Looks like The modified bolt carrier and stripped upper are sold separately. The bolt carrier with bolt handle is $150 and the stripped upper is $200
http://www.fulton-armory.com/M6Parts3.htm
Alexander Arms has a beefed-up side-charging upper with a chromed carrier for $325
http://www.alexanderarms.com/sitesho...?cat=2&item=80
American Spirit sells the upper plus modified carrier for $375
http://www.americanspiritarms.com/pr...ver-38-12.html