I don't get many Gas Blowback Airsoft Rifles to review all that often so when I get my hands on them I sure have a great time testing them out and feeling the blowback action tapping me in the shoulder as I shoot in semi or full auto modes. Sure Gas Blowback Airsoft Guns don't perform like their AEG counterparts, especially when you're shooting in full auto. You can expect way less rounds in each magazine and even with less rounds the last 5 or 10 shots when shooting rapid fire are going to be compromised but I really don't care because a well made Gas Blowback Airsoft rifle like the KJWorks M4 CQB Carbine GBB is just so much more fun to shoot than an AEG and way more realistic.
So let's get on with my test results for the KJWorks M4 CQB Carbine GBB Airsoft Rifle... The fps consistency was really decent, super consistent when I spaced out my 5 test shots they averaged 377 fps, not really having any low or high fps shots out of the bunch. I did have a full gassed up mag and was using .20 gram plastic 6mm Airsoft BB's for this part of the field test.
Again shooting in semi auto mode, I placed 10 rounds into my paper target setup downrange 30 feet and as per usual I was using a rested shooting setup sitting on a stool and resting the KJWorks M4 CQB Carbine GBB Airsoft Rifle on a sandbag up front. 9 out of the 10 rounds all grouped in about a 3/4 inch group with only 1 round coming outside a bit stretching the 10 shot grouping out to about 1.5 inches. Still really great for a Gas Blowback or any Airsoft rifle for that matter!
Next I shot the rest of the mag in full auto burst mode which was about 20 rounds left in the KJWorks M4 CQB Carbine GBB Airsoft Rifle at this point. As expected the KJWorks M4 CQB Carbine GBB Airsoft Rifle cooled down pretty quick and the last 5 rounds did fire just fine but there was a noticeable drop in power making the rounds shoot low on the target. Keep in mind I was shooting in a not too warm environment, about 15 degrees which is not bad but also not that warm.
I would have liked to have seen the KJWorks M4 CQB Carbine GBB Airsoft Rifle perform as consistently in full auto mode as it did in semi auto but that would have been asking a bit too much from a Gas Blowback Airsoft rifle. The KJWorks M4 CQB Carbine GBB Airsoft Rifle is a really well put together Airsoft Rifle that didn't let me down in the end.