This is one of the few air rifles that I prefer the plastic composite stock. It has a much better shape
with some grip panels in the pistol grip and forestock.
I have looked at repeater air rifles in CO2 for some time but the use of Powerlet CO2 cartridges
always put me off until I saw that Gmac Custom in the UK makes a Crosman 1077 adapter for fitting
a paintball tank.
In the above photo you can see the original setup of powerlet and piercing rod vs the Gmac paintball
adapter. The Gmac adapter is a high quality product of brass construction and still allows the use of the
I tried a Crosman red dot sight on the rifle but was not happy with its accuracy, so replaced it with
a Gamo Compact 4x32AO scope, which surprised me with its quality of construction and clear optics.
The rifle was first tested with the powerlet setup :
The trigger requires a 6.8 lb pull as it rotates the magazine rotary clip and cocks the rifle (revolver style).
This is an average trigger pull as measured by my DIY tigger pull gauge.
So it takes some mastering to get good groups but is aided by the broad trigger blade, also the correct
choice of pellets is important.
The rifle handles well being light and the plastic composite stock has a nice solid feel to it. I did add
some solid foam rubber between the stock and plastic butt pad to give some padding.
The rotary clip , two being supplied with my rifle takes 12 pellets and this is fitted into the magazine which is then
inserted into the underside of the rifle.
I found that Crosman Premier FT 7.9gn and Crosman Match 7.4gn pellets gave me the best results.
Using my Shooting Chrony with a warm 28C day I recorded the following using Crosman Match 7.4gn
565.0, 552.6, 540.4, 540.5, 534.2, 541.2
Max 565.0 Min 534.2 AV 545.7 ES 30.7 SD 11.26
Crosman Premier 7.9gn Max 571.2 Min 523.4 AV 545.2 ES 47.8 SD 16.85
The target was shot at 12m using Crosman Match - 12 shots, the last 6 after getting to grips with the
trigger into a good size group.
So in summary this is a fun air rifle even in standard form and at close ranges can produce acceptable
accuracy if you can master the tigger pull. The Powerlet CO2 cartridges are good for 36 shots after
which the velocity drops off.
The Crosman 1077 was then tested with the Gmac powerlet eliminator fitted.
The temperature was 24C and using a 9 oz paintball tank and a Tippmannn remote line
the following results were measured using my Shooting Chrony
Crosman Match 7.4gn
515.4, 516.2, 516.2, 518.9, 518.8, 515.8 ft/sec
Max 518.9 Min 515.4 AV 516.9 ES 3.54 SD 1.41
Crosman Premier 7.9gn
Max 513.3 Min 496.8 AV 507.4 ES 16.48 SD 6.32
In conclusion : I am very satisfied with the results obtained using the Gmac adapter as it gives
much more consistent shot on shot results compared to the powerlet.