each has it's pros and cons
g4a1: Great looking gun. It doesn't appear to be too long and it doesn't appear to be too short too. it has enough ris to make it available for accessories. the down side though is the scope mounted on the gun. I do not like scopes on airsoft guns especially on automatics. reason being is at the range and considering accuracy, you might as well go with a red dot and be as or more effective because you are not focused within a tiny viewing area.
2.5/5 cqb 3.5/5 field (better sight would bring it up to a 3.5 and 4.5)
g4a2: This gun appears to be great for cqb. but in saying that there is a problem with the scope. it appears to be mounted quite high which causes problems at short ranges because the sight might be off of the line of fire for short ranges. other than the scope, with being shorter it probably doesn't have a long range. I give it a
4.5/5 in cqb and 2/5 for field.
g4a3: again. Great looking gun. mostly the same as the g4a1 but it has a more appropriate sight for airsoft (big plus for me if you can not tell). my only problem with the gun is the orange flash hider. I do know though that it is illegal for airsoftgi to sell guns without the orange flash hider but they could include the black with the gun even if it means an extra $10.
3.5/5 cqb 4.5/5 field
g4a4: This gun appears to have been accessorized to it's full which is nice but that is a limitation also. It also doesn't have the crane stock which is a huge negative in my eyes though the stock looks good. looks it appears ok but without the crane stock and with limited external modifications available i do not like the gun because i like the ability to add tactical gear to the gun. and again the orange tip.
cqb 3/5 field 3/5
g4a5: Decent looking gun but it almost seems awkward to me. the really long ris make the gun seem like it should be longer or the ris was made too long. again the scope ruins the gun for me but at least there is a crane stock. the one good thing about the gun is it has the SCAR flash hider, (i love scars) which has threading for the mock suppressor but the problem with that flash hider is if you do not get the suppressor with it then you have to buy another flash hider also. this gun also would not fair well in cqb because you would not be able to stick the barrel through holes if needed because the ris would block that.
cqb 2/5 field 3.5/5