Tony, the 20 gauge barrel & forend fitting was done by Dewey Vicknair, well known to most of the Parker brethren.
Just a few words on shooting 20 gauge/3-inch BCC factory shells in this gun ...... remembering our physics classes, the recoil transferred to the head of the stock is based on only three parameters: mass of the ejecta (shot, wads and powder gasses), velocity of the ejecta, and mass of the gun. Pressure of the load is not a consideration.
Now let's figure...... The 20 gauge BCC ejecta is lighter than many 12 gauge loads the VH was designed for. And let's assume the 20 gauge velocity is about the same as the 12 gauge with comparable hunting loads. And we'll keep in mind the gun is significantly heavier with the 20 gauge/3-inch barrel mounted, than is is with the factory 12 gauge barrel. Ergo, less recoil is transferred to the head of the stock when shooting the 3-inch BCC 1-1/16 oz loads than when shooting something like 1-1/8 ounce 12 gauge hunting loads. Way less than when shooting 1-1/4 ounce 12 gauge hunting loads.
This VH has been out on the sporting course many times. Those 32-inch 20 gauge barrels point like a magic wand
Plenty of mass in either set of barrels
