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TM FN Five-seveN GBB

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Different pistols have different designs. My TM, as well as my Marushin has no larger a gap than is on the real one. Unless the one you saw does not look like any of the others in this thread or the FN picture thread I fail to see how it is an issue. If the gap is larger than the others you see pictured then the slide was seated incorrectly but I don't think it could function properly with the slide seated incorrectly.

Edited by frogfish

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On the Marui 5-7, the guide rails on the BBU are separate pieces that are pegged at the front and screwed at the back. Due to excessive recoil with green gas, this is another part that fails: the pegs sheer off. The screws are still held fast but the effect is a slight tilting motion of the guide rails. When the slide is forward and in battery, there is no noticeable difference (and will not affect accuracy). But with the slide locked at the rear and with the slide lock pushing it up, the gap is more pronounced by about 0.5mm.

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There was an issue in mine where the gap was very large - I found the hammer mech's screws that secure it to the lower frame were loose, so I simply retightened them. Now there isn't an issue at all.

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There was an issue in mine where the gap was very large - I found the hammer mech's screws that secure it to the lower frame were loose, so I simply retightened them. Now there isn't an issue at all.

 

i'll have to let him know

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I don't find the gas efficiency of the five seven to be very good. The only reason you get so many shots per fill is because of the huge size of the magazines (i.e. it still uses a lot of gas per shot). I usually get 60-80 shots per fill

 

Compared to my S7 USP, which has a smaller mag, I can get up to 150 shots off of 1 fill of propane (yes really, I repeated the test several times, 1 fill of gas left to heat to room temperature, mixed rate of fire, reloading BBs as fast as I could between magazines and not heating the magazine between BB refills, got 110-150 shots per fill).

 

So long story short, you get a lot of shots per fill on the Five Seven, but the efficiency isn't brilliant.

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That's because it recoils like a *beep* and that's gonna have to come from somewhere (gas). What we really need to do is create a standardized index of just how much gas is used per shot. Like take a shot then weigh the mag difference and then create a curve with respect to temp.

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Or (mass of magazine after filling with gas) - (mass of empty magazine)/number of shots fired from gas fill = average mass of gas used per shot.

 

I'd give it a go, but I don't have any precise scales available.

 

Also, the USP also kicks very hard, and has a metal slide :P

Edited by kruck

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I am very satisfied with how many shots I get from the mags....really impressed actually. Also, do you guys have pics of the problems with the sites you are talking about? I'm not sure I understand. I was just inspecting my 5-7 to keep an eye out for such issues. thanx.

 

 

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First major failure I've had - the front part of the Guarder slide is about to blow itself off. Pictures once I stop being so lazy to pull out my pistol XD. I'm going to try and secure it tonight with some RTV silicone sealant, but, seriously, Guarder, WTH? Can you not make something that's NOT ######?

 

EDIT: Pictures.

 

IMG_0949.jpg

 

IMG_0950.jpg

 

IMG_0952.jpg

 

I decided to wash the slide completely and disassemble it for fixing with sealant. After I washed it I found it had cracked along the front as well (similar to renegadecow's):

 

IMG_0953.jpg

 

IMG_0954.jpg

 

I'm sorry, but Prometheus needs to come out and make a frame for this pistol - it's a really BA gun, but the fact the external support is almost only done by Guarder is just too much fail.

Edited by aznriptide859

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I did, and part of me thinks that the fact the metal inner isn't very well secured, that it's internal movement first made me wear down the front sight (you can see on the slide where it's already moving), then somehow slamming the front part of the slide off.

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That was gonna be my guess, as it looks like the guarder frame is made of a stronger material than the TM inner slide, so in a stock replica I would feel like the inner slide would give out first.

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I dunno, the stock inner slide in mine is still perfect despite having split both the stock slide and Guarder one. But I haven't been having any more problems since the staple. My only reasoning would be since the stock inner slide is plastic, it can absorb some of the shock from the recoil. And when you have the metal inner slide on, most of the shock is transferred to the slide with the metal being inelastic.

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I went ahead and swapped back to my TM slide w/ the plastic inner...omg the blowback feels wimpy now LOL. But renegade you make a point - I can see why that would cause the front of the slide to blow off.

 

I don't care that the RS 5-7 doesn't have it, but I want a metal slide for this thing.

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