-Spyder SE-My very first marker and I've used several since, not nearly the same level of quality as AM products.
-Guns owned but not similar...a Cockers, a Blazer, Vision Impulse, a lot of pumps
Sentinel TS with a lot of trigger work
-68/4500 Pure energy tank
You really don't need a vig or other reg on there. It's already a pretty consistent gun by design, but it would do you good if you have the cash.
-Decent small bore barrel
I've been around a number of these markers, and there's a good reason so many people I know have them. They do very well on Co2 or air, This gun will shot a siphoned 20 oz co2 dry without freezing or skipping a shot, not as much can be said for other guns in the price range.
It doesn't have the annoying sear click other blowbacks do!!! (spyders ect, have a really light pull, then you feel the sear, then it fires once the sear drops,It makes these guns much harder to get a rhythm on) The pull on the sentinel is smooth an the same pressure throughout the pull (Much easier to dump paint once used to it), and if you have a couple small pieces of tape you can shorten the pull by 2-3 mm, from it's original 6-7mm.
The anodizing on these guns is top notch, I've played front in tourneys with it a number of times and only managed small scratches on the ball detentes (because it's a different batch of anno thats not as tough as the main body)
They are very accurate even with the stock barrels, as long as you don't shoot small bore alot you could go without buying another barrel.
The hammer and sear don't wear like I have seen on so many other blowbacks.
The bolt is Delrin, and lightweight reducing the kick (to do so further get a reg and some springs and set you input pressure to 450 or so)
They are very easy to strip down and clean, It shouldn't take you more than a few seconds to pull the pin on the bolt and slid out the hammer and bolt. It usually doesn't need much more than a few drops of oil and a wipe down when you're done playing.
If you don't pull you bolt back to cock the gun when you air it up you'll more than likely leak a bunch of gas down the barrel.
It is a mechanical blowback, and though it is a very good one, it still is harder to toss mass amounts of paint than an electro (wait until Jan for the AM Diadem to come out)
This is a really solid feeling and straight shooting gun that reeks of high tolerances and quality construction. With 5 minutes and tape you can have a 4 mm pull on it. All in all I would have to say it isn't the best gun out there, it IS, however, the best gun in it's class, and whether you want a nice maingun, or a backup that's actually good, and won't let you down, you can't go wrong for the money.