Product Review: Sig Sauer CP-1 Scope and STL-300 Stoplite.

kel-tac su16c

My “trunk gun”: A Kel-Tec SU16C with a SigTac CP1 scope and an STL300 laser/light.

I shot a 3 gun match last year with my trunk gun, a Kel-Tec SU-16C, to see how well it worked under stressful conditions. The rifle was surprisingly accurate and I was able to work the cross bolt safety with ease, which surprised me, because I shoot that gun left-handed due to my cross-eye dominance. One thing that did pop up, though, was that I forgot to turn on my red-dot sight before I started my first stage.


Now at a match, all that means is I’m a little more embarrassed than I usually am and a few wasted seconds to turn on the dot. However, if this had been a two-way shooting match with rounds incoming, that simple mistake would have serious issues.

SigTac CP1 3x Scope

Advantages: Clear optics, great value, good combo of magnification and field of view
Disadvantages: Confusing reticle
Rating: Four out of five stars

I decided to replace the Vortex Strikefire on top of my gun with an optic that was always on, and I settled on a Sig Sauer CP1 3×32 optic. I chose this optic for a couple of reasons: I wanted an “always on” optic that I could quickly use, and I wanted something that wouldn’t break the bank and leave me heartbroken if it broke on me. Yes, I could get an ACOG and get everything I wanted (and more) but somehow, putting a $900 optic on a $600 gun that I’m not going to use all that often just doesn’t make sense to me. Also, a fixed power 3x magnification scope gives me enough power to help reach out and touch people at 200+ yards and yet doesn’t give me tunnel vision for closer work.

reticleThe CP1 scope mounted quickly on the top of my SU-16, although its eye relief is a little short compared to the red dot I had on there before. If you closely look at the picture above, you’ll note that the scope is right up against the rear backup sight, and I still get a little blackout on it at times. The scope sighted in quickly: I prefer a 50 yard sight-in on my .223 AR’s, and I was able to get this one dialed in quite fast. The scope comes with options to light up the reticle in red or green light, and those controls are easy to activate and manipulate. The reticle, however, is my biggest complaint about this scope: It is much more confusing than a simple scope like this requires, and there is just too much information going on to quickly make a good decision about what line for what use at what range. A simple duplex or cleaner BDC reticle would have been much more useful than the mumbo jumbo inside this scope

Optically, however, the scope is quite nice, easily keeping up with other scopes in its price range. The colors are clear, the details are crisp and there is no noticeable “rainbows” of chromatic aberration in the reticle. It’s not an ACOG or a HAMR, but what it does, it does well.

SigTac STL300 Stoplite

Advantages: Blindingly bright, versatile, easy to set up and use
Disadvantages: Do I really need a strobe mode?
Rating: Five out of five stars

AA_magliteThe SigTac STL300 Stoplite is a natural compliment to the CP1 scope. It’s a powerful LED light, laser sight and vertical foregrip all in one, and attaches easily to any Picatinny-compatible rail. The LED light is very bright, and to test it, I set my camera on a tripod about 40 feet away from a white rollup garage door with the exposure set for 1 second at f5.6, ISO 400. The first pic is the garage door lit up with my old standby, a AA Maglite that I carried with me across two continents. The second shot is lit up with the STL300.

sig_stopliteAs I said, it’s bright.

The light on the STL300 has a “strobe” setting that I think is unnecessary and needlessly complicates things. If the bad guy(s) you are lighting up are not understanding that their lives are about to change for the worse, I don’t see how strobing them is going to reinforce that message.

The controls on the STL300 were set exactly where I wanted them: I found the laser and the flashlight easy to switch on, but due to my cross-eye dominance, I shoot long guns left-handed, and the controls may not be as well-placed for right-handed shooters.

The STL300 may not have the same rugged appearance as its higher-priced cousins from other manufacturers, and I haven’t done a ‘torture test” on it to see how it fares under highly stressful conditions, but you know what? I don’t care. I am NOT a Tier √-1 Operator operating operationally in an operational operating environment: I have a trunk gun in my trunk for the (thankfully) very slim chance that I’ll need something more than my CCW gun to deal with the crap going on around me, so that means the accessories on that gun are probably never going to be put to the test.

But I’m comfortable and secure with what the CP1 and STL300 will do if, God Forbid, I need to call on them. They’re not top-of-the line milspec gear, but I’m not a top-of-the-line milspec guy. Howver, these two SigTac accessories are definitely a step or three up from the bargain brands you see out there on and such.

If you’re looking for a couple of accessories to make your AR more effective in a hairy situation, you’d do a lot worse than these two SigTac accessories. I found both the CP1 scope and the STL300 Stoplite to be a good value for the money.