I too have spoke with Randy from Tar-hunt alot, over the past year. Very knowledgeable person. He does all of the R&D for Lightfield, builds his owns guns, and does all the conversions on the 870's. His information was pretty accurate from my experience and money spent, barrel slop, fliers from copper slugs, and the wind drastically effecting the accuracy of slugs. However to choke out $1000 when it's all said and done for a DSG, or $3000 for the Tar-hunt bolt, was a bit steep. So I found this article on this forum from gunhuntermag.com, about this small NY based gunsmith called Da-Mar, that pins barrels. Spoke with Dennis the owners son, he said he would pin my barrel, lengthen the forcing cone, do a trigger job, drill and tap a permanent Da-Mar mount, recrown my barrel order a new scope, and sight the gun in. And guaranteed my gun would be back in my hands 3 days after he received it, and I live in California. He did everything he said, and it was very inexpensive and unbelievably accurate. Tar hunt and the DSG I'm sure are good products, but what this small town gun smith can do for the price is amazing! Just thought I'd throw this info out there, for anyone looking for a great alternative to the good, but slightly pricy Tar-Hunt.