I picked my complete lower up from Rifle Gear yesterday. Unfortunately, they didn't have any of the replacement parts in yet. Since they don't deal with warranty related issues, they won't mail the parts out to me once they get them. I have to actually go in and pick it up. To be honest I'd rather just order the set from NFA for $5.
Also, how does one replace the pistol grip? Looking inside the standard grip, it isn't as simple as using a flathead screwdriver. If anyone knows how, please share. Thanks!