I own more than one gun. I own a couple machine guns. I have extensive experience with a wide variety of NATO and Warsaw pact Small Arms systems.
The kel-tech Sub 2000, in a civilian context, is one of the coolest funnest most unique and practical guns I’ve ever known.
I currently have four of them. A gen 1 that I keep because I have a custom shoulder holster for it that unfolds it as you pull forward on it and the shoulder holster doesn’t fit the Gen 2. A Gen 2 9 mil for Glock mags a Gen 2 40 cal for Glock mags and a CQB 9 mil integrity suppressed model I haven’t been able to take home yet.
As far as an optic Mount goes I think the best option is the red lion precision. It’s less bulky when folded. It’s also suited to a wider variety of optics including some traditional tube style magnified optics. I think the next best option would be the m-carbo mount. I have the m carbo Mount but it’s very bulky and protrudes dramatically when folded.
Offset sites and even an optic work well on this platform just make sure you get it zeroed correctly and then use the sites in the manner in which they were zeroed. This is not a long range precision sniper system where we’re going to worry about the can’t of the weapon.
To a new purchaser who hasn’t yet got the base gun I very strongly and highly recommend buying the m carbo m series Sub 2000 with the upgrades already on it. When you look at the cost of the base gun from most places and the cost of adding those parts on later after the fact it is a major savings. Not to mention your time and effort also has value. Plus shipping ads up.
In regards to the choice of the double finger or recoilless charging handle I recommend the recoilless because it does help reduce recoil. Obviously it’s not truly recoiless hat’s just silly but it helps. In regards to the choice of peep sight or notch site I generally prefer a peep sight however in this case I personally would choose a notch site just a bit higher than the peep and the site’s being too low was a big deal for me.
Since you have the base rifle already I will recommend purchasing the approximately $234 all in one bundle and whatever parts are missing from it in comparison to the m series does for example I think the site and one or two other things. One thing to m series has that I would probably skip if I were doing it separately is the muzzle break. I personally just don’t like them and I’d rather leave the threads available for mounting a suppressor. An a2 style compensator in 9 mil or even one that has the slots all the way around makes a great thread protector and also allows you to make contact shots that are vented at the muzzle if need be.
Do not buy the m carbo butt pad. Not worth it. Their stuff is so great and then they put this turd out. Oh well. For a butt pad I recommend the Missouri tactical.
On the m carbo website there is an instruction form for if you want to have m carbo install parts for you. Ignore it they charge over double what Kel-Tec does. There is also an instruction form for if you want Kel-Tec to install parts for you. That’s the one you want check out and read that instruction form. Last I knew Kel-Tec wood install as many parts as you want for a flat fee of $40 including return shipping. That is a truly astounding and shocking bargain!
Also last time I spoke to Kel-Tec it turned out that although m carbo specifically omits this information Kel-Tec as part of that same previously mentioned service will also install other parts that are not m-carbo such as the Red Lion precision for end but possibly excluding fire control group parts as they’ve only tested the m-carbo ones and there are warranty issues.
By the way, while it’s at Caltech have them throw a brass bolt weight in it. This is a part only available from Kel-Tec as far as I can tell. I really wish m-carbo sold it or even made it part of their m series. Other than the muzzle brake which I don’t care for this does the most for recoil reduction.
I highly recommend going and checking out the Kel-Tec owners group forum.
Best wishes.
Ted