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What is that XN drive block made of? It feels too light to be aluminum. I thought it was plastic when I took it out of the bag, but it is definitely metal.

guide rod, nut or both? I'd say BOTH , looking for a good nut/thumb wheel , whatever you want to call it, that will both hold tight , yet easily removable. Preferably WITHOUT tools. Somebody finds something that we end up using, it will be good for a FREE guide rod replacement We're looking at a couple options still need to do some testing though , now GET TO WORK These would be nice, but maybe a bit pricey http://www.carrlane.com/catalog/index.cfm/27825071F0B221118070C1C513E111D081B0006280B1713050245221E0107070F1A3C3B2853524155 21.00 each I would think something more lik

The tac-choke looks more like the invector tube in your picture, as did the browning choke I tried. They thread into the barrel but not all the way and leave a gap of about 1/16th of an inch. As far as the factory chokes, I have to use the choke wrench with an extreme amount of force to seat them all the way into the barrel. I can only hand tighten them until there is about 1/8th of an inch sticking out of the barrel.

The rio stuff has worked flawlessly in my gun - bird loads and buckshot. The only failures I have had were FTEs 3 or 4 times all with estate #8 rated at 1250 fps. The lip of the brass looked a little more rounded than normal.

guide rod, nut or both? I'd say BOTH , looking for a good nut/thumb wheel , whatever you want to call it, that will both hold tight , yet easily removable. Preferably WITHOUT tools. Somebody finds something that we end up using, it will be good for a FREE guide rod replacement We're looking at a couple options still need to do some testing though , now GET TO WORK These would be nice, but maybe a bit pricey http://www.carrlane.com/catalog/index.cfm/27825071F0B221118070C1C513E111D081B0006280B1713050245221E0107070F1A3C3B2853524155 21.00 each

Another XN here, and I had the same issue - cut the stock just as instructed and looked inside to see the hole in the upper was too low. I had to re-grind the angle on the boss located on the back of the adaptor to make it work. I just hope removing the material doesn't weaken the part too much. It came out looking good.

I've tried a winchoke and a browning choke which was identical to the winchoke when side by side and neither would screw all the way in my barrel. Both left a gap inside the barrel between the base of the choke tube and the chromed portion of the barrel. I recently received the tac-choke from Centerfire, which is supposed to be a winchoke as well. It does not screw all the way in either. When compared to the supplied choke tubes, I noticed that the winchokes' threading continues about 1/16" closer to the base of the choke than do the mka chokes. Obviously, my barrel is not threaded de

I walked around harbor freight for 45 minutes looking for that tool; all I had to do was look at their website... ended up putting the upper in a vise and using a small pipe wrench with some good tape to avoid marring the rod. Worked well.