I'm looking for the following BATFE Tech Branch opinion letters that were issued prior to the expiration of the AWB. Any help would be appreciated in locating these letters.
1. Adjustable Butt Plates
2. Pinning a collapsible stock
3. Replacing a damaged preban mag body with a postban mag body
4. Manufacturing variance allowing certain lever action center-fire pistol caliber cowboy rifles with 13 rd tube magazines.