3vi1-D4n Posted January 23, 2018 Report Share Posted January 23, 2018 (edited) ROF is a strange one in airsoft. One factor is the blowback velocity, which is dependent on piston/cylinder volume, bolt weight, gas velocity as well as gas output. The other factor is the return spring tension. And there can be two return springs. One is the spring that returns the bolt carrier, the other one is the buffer spring which can aid in the return. This is assuming the bolt carrier hit the buffer at the rear. In real steel, you require a HEAVY spring to keep the bolt closed before the bullet exits the barrel, particularly if the SMG has a short body and by doing that you increase the return speed. You COULD lengthen the body and so the BCG never hits the rear, and hence lowering the ROF. In airsoft If you have two return springs, and the bolt carrier hits the rear, it may be better to LIGHTEN the bolt carrier return spring rather than to increase tension on that spring. The lighter the BCG return spring, the faster the blowback action would be, so it would hit the buffer quicker and faster, and would be hitting the buffer return spring fast enough to store more energy for a more forceful return. It would also be more gas efficient. I always lighten the bolt carrier return spring, as it creates more efficient systems and better blowback. But another thing to consider, shorter springs doesn't mean less power. I have a very short spring I got out of my A&K MGs, consistently giving more power than the longer M120s. Edited January 23, 2018 by 3vi1-D4n Quote Link to post Share on other sites
The Disavowed Posted April 25, 2018 Report Share Posted April 25, 2018 Just a heads up for anyone wanting to try this, I tried out my real steel slither stock on my WE to see if it fits, and it does not. The handgrip section on the WE is a fraction too wide and will not slot in. It does however fit on the vfc model with only a small modification needed to the buffer spring. It is a shame as I would have liked the slither stock for my WE, so if anyone has a spare one knocking about, or wants to swap for an a4 solid stock, hit me up. 1 Quote Link to post Share on other sites
NonEx Posted April 30, 2018 Report Share Posted April 30, 2018 (edited) Took some pics of my WE "Apache" MP5A5 with VFC rail mount, Konus red dot sight and VFC handguard with light Edited April 30, 2018 by NonEx 1 Quote Link to post Share on other sites
DrAlexanderTobacco Posted April 30, 2018 Report Share Posted April 30, 2018 Dope/cool/good/amazing 1 Quote Link to post Share on other sites
Bloodsword Posted January 8, 2019 Report Share Posted January 8, 2019 I want to show my WE MP5. I managed to fit a RS hand guard and rear stock + B&T rail mount. 5 Quote Link to post Share on other sites
Wingly_Actual Posted January 20, 2019 Report Share Posted January 20, 2019 Are the outlet valves the same as any of WE's CO2 pistols? Just in case I want to DH mod it... Quote Link to post Share on other sites
Rob15 Posted January 20, 2019 Report Share Posted January 20, 2019 The valves are the same as the normal WE pistol valves, but I doubt a DH mod would go well on the MP5 magazines, they are nowhere near as well designed or robust as GHK magazines are but I reckon they'd at least leak before blowing themselves apart. Quote Link to post Share on other sites
Wingly_Actual Posted January 21, 2019 Report Share Posted January 21, 2019 (edited) 1 hour ago, Rob15 said: The valves are the same as the normal WE pistol valves, but I doubt a DH mod would go well on the MP5 magazines, they are nowhere near as well designed or robust as GHK magazines are but I reckon they'd at least leak before blowing themselves apart. The 40 round open front ones would seem to be the best candidate as they are a solid piece. I plan on getting the z-parts steel FCG as well. There doesn't seem to be a whole lot that can go wrong. Has anyone had any problems with internals going bust yet? Edit: I want to do the same thing with a Guarder G17 Edited January 21, 2019 by Wingly_Actual Quote Link to post Share on other sites
blobface Posted January 21, 2019 Report Share Posted January 21, 2019 This might not necessarily apply but someone's WE M4 mag exploded inside a car from being left in the sun filled with green gas, resulted in a damaged windscreen, there was a video of it on YouTube if I recall correctly. The question is, how much stronger is the MP5 mags? Also, how does the pressure of CO2, 850psi in room temperature, compared to propane under the sun? At 70c°, which is pretty hot, the pressure is only 360 PSI, less than half of CO2, probably similar to what's inside a hot car yet a WE mag exploded, so I wouldn't want to bet my fingers on this, but if you have facility to safely test the failure point of this magazine, like how Devilhunter had hydro tested his experiments, then sure, but I certainly wouldn't just "go for it" and see what happens... You could argue solid piece is actually worse, three piece design means there are weak points at the join, perhaps resulting in bulging in the joints (thus relatively safe leak), where as a solid piece only has one way to fail if the valve doesn't first. 1 Quote Link to post Share on other sites
Got Wood? Posted January 21, 2019 Report Share Posted January 21, 2019 I have a question now these have been out for a good while. I had the kurtz model, and eventually the hop gave out. Adjustment didn’t do anything, and didn’t seem fixable from what I remember. I read a guide on how to swap out the parts for TM style rubber and barrel, but the guide was incorrect in a couple of places which made the swap not possible. Are they still using their proprietary rubber and barrel, and how have other people’s units and rubbers held out? Quote Link to post Share on other sites
AMPZ28 Posted January 23, 2019 Report Share Posted January 23, 2019 If i order a mp5 a3, and since im in the U.S. this will require it be shipped with the orange tip (orange front sight) is this part still metal or is it plastic? in which case i would need to order a front metal sight. Also, is there a steel charging handle upgrade out there? Im wondering how sturdy the pot metal stock one is. Quote Link to post Share on other sites
DarkLite Posted January 23, 2019 Report Share Posted January 23, 2019 On 1/21/2019 at 5:33 PM, Got Wood? said: I have a question now these have been out for a good while. I had the kurtz model, and eventually the hop gave out. Adjustment didn’t do anything, and didn’t seem fixable from what I remember. I read a guide on how to swap out the parts for TM style rubber and barrel, but the guide was incorrect in a couple of places which made the swap not possible. Are they still using their proprietary rubber and barrel, and how have other people’s units and rubbers held out? I swapped my full size MP5 hop and barrel out and there was no issue - the only thing is you need to switch both the barrel and hop up rubber at the same time as the new WE cut has different internal dimensions, even though the external dimensions are the same as the usual TM/WE. I'd recommend a MapleLeaf Crazy Jet barrel and a 50 deg Super bucking. Quote Link to post Share on other sites
Got Wood? Posted January 23, 2019 Report Share Posted January 23, 2019 Thanks Dark. I tried that, if memory serves the hip unit itself had protruding legs for the barrel to hold it still. An extra pair over the TM, which made a barrel change not possible? Quote Link to post Share on other sites
DarkLite Posted January 25, 2019 Report Share Posted January 25, 2019 On 1/23/2019 at 3:36 PM, Got Wood? said: Thanks Dark. I tried that, if memory serves the hip unit itself had protruding legs for the barrel to hold it still. An extra pair over the TM, which made a barrel change not possible? Maple Leaf Crazy Jet barrels are designed to fit WE GBBs and TM GBBs, they have the extra cuts. 1 Quote Link to post Share on other sites
renegadecow Posted January 26, 2019 Report Share Posted January 26, 2019 On 1/23/2019 at 1:14 PM, AMPZ28 said: If i order a mp5 a3, and since im in the U.S. this will require it be shipped with the orange tip (orange front sight) is this part still metal or is it plastic? in which case i would need to order a front metal sight. Also, is there a steel charging handle upgrade out there? Im wondering how sturdy the pot metal stock one is. Front sight is metal as is the 3 lug muzzle. You can either get the muzzle painted or have an orange plastic pdw flash hider put on. The charging handle itself is zinc alloy but AFAIK the shaft running through it which comes into contact with the charging handle tube is steel. Quote Link to post Share on other sites
Ryaw Posted April 3, 2019 Report Share Posted April 3, 2019 Looking into the MP5K version, there are a lot of different numbers listed as to how many rounds the shorter K mags actually hold. I've seen the K advertised as coming with either a 26 round mag, or a 15 round mag (and KYAirsoft actually says 20!). Have there been two different versions released, ie an updated MP5K since the initial 26 round mag, but now with a newer 15 round mag? Spare K mags appear mostly listed on several websites as only being 15 rounds, so are there 2 different versions of the K mag? Anybody bought any recently? How many do they actually hold? I'm aware of the longer 45 round open front and 30 round closed front mags. Thanks. Quote Link to post Share on other sites
PanteraTigris Posted July 23, 2019 Report Share Posted July 23, 2019 Can someone post again the paper clip mod for the Magazine stop switch? Quote Link to post Share on other sites
blobface Posted July 23, 2019 Report Share Posted July 23, 2019 (edited) Pretty sure I posted that mod but I can't even find it myself, maybe the thread was removed for some reason? *I'll redo it at some point and post it here, it was very thin piano wire as oppose to paperclip. Edited July 23, 2019 by blobface Quote Link to post Share on other sites
Wingmann Posted September 14, 2020 Report Share Posted September 14, 2020 So, how are these holding up and what parts/upgrades should I stock if I decided to buy one nowadays? Quote Link to post Share on other sites
alexd22 Posted December 25, 2020 Report Share Posted December 25, 2020 (edited) Hi guys, first post from a long time lurker here. Well, I got into cheap airsoft with my buddies over the lockdowns (on private property, don't snitch!). Now I'm ready to get a "real" gun so we can do some arena games once everything's back to normal. This seems like the perfect gun for CQB, so I'd also appreciate any newer advice, updates or reviews on the gun I also looked through some Airsoft MP5 lists online and some of the cheaper ones also seem like solid guns. But tbh I kinda trust forums and actual user discussions more. Edited December 25, 2020 by alexd22 Quote Link to post Share on other sites
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