Reviews & Ratings for Primary Arms SLx 3x MicroPrism Red Dot Sight — 112 reviews — Page 1

Good small 3x with many mounting options included. Clarity isn’t as good as their glx series. Has nice reticle design. Intensity knob is stiff to move. Battery cap can become loose if you turn intensity knob counterclockwise. The auto on feature allows it to be left on if necessary so knob won’t have to be moved as often anyway.

Was on the fence about this one for a while and im glad I finally pulled the trigger. Ive got it on an 8.3" 300blk with an sbpdw brace and fully extended the eye relief is spot on as soon as you throw it up. Glass is crystal clear and has tons of illumination levels for any environment. Definitely recommend over an lpvo or dot and magnifier combo for weight savings alone.

This is my first quality etched/prism optic and it is wonderful. Ive been seeing nothing but starbursts for years now with various red dots and wish I would have bought sooner. 10/10 would buy again

I have astigmatism so all red dots are 100% starburst for me and though holographic sights look much better they still aren’t perfectly clear for me. On the other hand this prism sight is 100% crystal clear for my aging eyes with astigmatism. I own Eotech, Holosun, Vortex (all very expressive sights) and this Primary Arms SLX looks the crispest BY FAR at half the price. At 3x the eye relief isn’t bad at all i can shoot 2 eyes open with very little issues the eye box is very forgiving. It comes with various mounts which is awesome for this price point. I purchased a Mini Acog QD mount and this thing is absolutely perfect for me. It gets daytime bright and it also has a etched reticle as well which is an amazing feature for the price. High quality dials that are nice smooth and tactile, the functionality and making adjustments is very simple. I zeroed it and shot 200rds and it held a perfect zero.

If you're looking for a great mid-level optic for your AR, this is for you. The clarity is very good and the etched reticle works great with the 3X magnification.

Comparing it to the Vortex 3x i already own. The reticle on this optic is far more eye catching than the Vortex. The horseshoe is thicker and easier for quick target acquisition. Comes with tons of mounting options. The unit is very small overall and actually looks kinda funny on my Aug but it does perform well. Eye relief is terrible but that has been the case with every prism i have ever used.

Great product, lots of mounting options, i mounted on my Galil 7.62x39 pistol, looks and work great, highly recommended.

The optic itself is fine. It’s compact, lightweight, has reasonable eye relief, and is acceptable quality for the price.

The issue is the fasteners for the mount.

First, the manual calls for torquing the 10-32 cross bolts to 55-60 in-lbs. I did this, set the rifle down, and 15 minutes later, a fractured cross bolt pops out of the hole.

Second, the 10-32 x 5/16 low profile screws have a 2.5mm hex socket. The threaded holes in the mount have locking helicoils with a ~15 in-lb running torque. The manual specifies 25-30 in-lb installation torque. These tiny hex sockets will strip at around 20 in-lbs.

I contacted the PA customer service. The service reps were responsive and easy to work with. They informed me that the torques in the manual were erroneously high, gave me lower torque values to use, and offered to send me a replacement mount. I received the new mount within a few days, free of charge.

I ended up using a screw extractor to remove a few screws and I replaced all the 10-32 x 5/16” ones with off-the-shelf alloy steel button head screws with 1/8” hex sockets. I had to machine down the head diameters to fit, but otherwise, these worked so much better than the OEM screws.

It’s frustrating that PA did nothing to fix this product flaw or alert customers about it. There are Reddit posts dating back 3 years describing this exact same issue. And all of the PDF versions of the manual on the PA website still list the higher torque values.

I have trouble trusting the produc...
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Bought this for my 5.56 ar15 platform and love it. Perfect site for what i needed.

Super lightweight which was perfect for my "lightweight" 300blk AR. Optic is bright even on low setting.