The Sig Sauer MCX ASP .177 Caliber CO2 Pellet Rifle is my third go around with the Sig Sauer ASP Series of MCX and MPX Air Rifles. Back in 2016 I tested out the Sig Sauer MPX ASP .177 Caliber Pellet Rifle and it performed pretty well for me. Recently I reviewed the Sig Sauer MCX Virtus PCP .22 Caliber Pellet Rifle and again got good results once I figured out the right pellet for it. So here we are again with a very similar Sig Sauer Air Rifle.
Starting with my Chronograph velocity testing for the Sig Sauer MCX ASP .177 Caliber CO2 Pellet Rifle, I used a brand new Sig branded 90 gram CO2 cartridge along with 6.9 grain RWS pellets. The temperature was 24 degrees Celsius (75 degrees Fahrenheit) in the Sea Can Indoor Airgun Shooting Range. Sig claims the Sig Sauer MCX ASP .177 Caliber CO2 Pellet Rifle to shoot up to 5.7 Joules. My Chrono testing resulted in an average fps of 418 with the 6.9 grain lead pellets which yielded a 3.7 Joule (2.7 foot pound) power output. I was not expecting 5.7 joules as that would have been closer to 600 fps using 6.9 grain pellets.
Next I setup a fresh paper target 30 feet down range and using seated and rested shooting position I placed 10 rounds into the target. The Sig Sauer MCX ASP .177 Caliber CO2 Pellet Rifle shot a decent 1.5 inch 10 round grouping but I am pretty sure I can get better results once I find the right pellet, I have found this especially to be true with Sig Air Rifles. My MCX Virtus was able to get 1/2 inch groupings at 50 feet once I found ammo it liked and my MPX also shot a bit tighter form 30 feet out with a different ammo selection. I then unload the remaining 15 rounds in to the target rapid fire, followed by another 30 round full magazine and the grouping only stretched out a little bit, closer to 2 inches. Shots placed on the target a little bit low and to the right but this can be easily corrected for consistent bullseyes using the fully adjustable sights.
The Sig Sauer MCX ASP .177 Caliber CO2 Pellet Rifle performed well for me in general, I did find that occasionally the belt did not index resulting in a misfire (no pellet fired) but the next pull of the trigger would index the belt resulting in a pellet firing, there where no jams and all rounds from the belt where fired. I am not sure why this happened as this did not happen to me with my other Sig Sauer Air Rifles. Perhaps I short triggered it a bit not getting a full belt index. I know many of you have been waiting for a Canadian version of the Sig Sauer MCX ASP .177 Caliber CO2 Pellet Rifle, now that we have them in the All Black Iron Sight Version and FDE Red Dot Version, make sure to get one as once we run out I am pretty sure we will no longer be able to get these Canada Import Legal Sig Sauer MCX ASP .177 Caliber CO2 Pellet Rifles.