Just got a Donny fl Ronin for my BT65, .25 cal. If you're thinking of getting one you should be aware of the following. First off, I can't say enough about the product quality and the great service. Ordered it on Friday & recieved it today, SUNDAY! OK, here's the deal. Being that it's threadedfor 1/2x20 unf I thought I just had to remove the QE shroud & screw it onto the barrel end. I did that but when I took a shot it really wasn't any quieter than the factory shroud. Wasn't too impressed. Luckily I also purchased the adapter that allowed me to put it on the end of the factory shroud. Holy crap! What a difference! It'll add another 6.5" to an already long gun but I needed a quieter gun & now I have it. I ordered it in .30 cal. per Donny's suggestion & can't wait to try it on my .30 too. GREAT service & product, a rarity these days!