huggytree Posted December 16, 2017 Report Share Posted December 16, 2017 (edited) got 2 mags in today and swapped out the springs with new Wolff springs and noticed a huge difference in lengths shortest is from a slab FXO 41middle is from a Gpm 42longest is a wolff curious why different mags would have different length springs from the factory? has this been noticed before? no gun to test them on yet, but i figured after reading endless posts about jams from mags i should just change them out from the start Edited December 16, 2017 by huggytree Link to comment Share on other sites More sharing options...
Bridgeport28A1 Posted December 16, 2017 Report Share Posted December 16, 2017 The two original springs have taken a "set", I will await the engineering explanation of the spring length differences. Link to comment Share on other sites More sharing options...
Robert Henley Posted December 16, 2017 Report Share Posted December 16, 2017 I've got 10 MP40 magazines. Six are the 98E code. I noticed in shooting my C&R BNZ41 MP40 that some of the magazine springs seemed worn. When I loaded 20 or so rounds everything worked great, but if I loaded to 30 rounds I could tell the magazine springs were not up to the load. I'll be interested in some feedback on the Wolf springs because I'm thinking about buying some of them and doing some range testing with the new springs. Robert Link to comment Share on other sites More sharing options...
M17ap Posted December 16, 2017 Report Share Posted December 16, 2017 You need to count the coils on the spring. Did a rough count from pic around 28 coils. If they both have the same number of coils then the shorter spring has set . It may or may not feed a full mag reliably. Link to comment Share on other sites More sharing options...
azboater Posted December 17, 2017 Report Share Posted December 17, 2017 Huggy,Wolf always advertises their springs with about 10% more "Umph" than factory springs,I have changed all my springs in my MP40 mags to Wolf and all feed reliably without messing with the length at alland none were exactly the length of the originalsI did save all the original springs, I can't bring myself to recycle any of the original parts history of the magazine Nick Link to comment Share on other sites More sharing options...
huggytree Posted December 17, 2017 Author Report Share Posted December 17, 2017 the wolff advertises 10% more strength.......this pic proves it may be best to just start out with new springs from day one...bought 10 from wolff for $64 shipped....seems like a small price to pay for reliability help from day 1 im not touching the mag the gun came with until after i test fire the gun with it....but i plan on replacing all the other mag springs as they arrive in the next week.... should have my gun next week, so ill let you know if the mags were reliable.... the shortest spring was from the mag that appeared to be in the nicest condition....least used......it had corrosion from storage, but no wear from use...edges still have all the bluing... did all the mags use the same spring? or did each factory make their own spring?? did springs change from year to year? Link to comment Share on other sites More sharing options...
huggytree Posted December 17, 2017 Author Report Share Posted December 17, 2017 Huggy,Wolf always advertises their springs with about 10% more "Umph" than factory springs,I have changed all my springs in my MP40 mags to Wolf and all feed reliably without messing with the length at alland none were exactly the length of the originalsI did save all the original springs, I can't bring myself to recycle any of the original parts history of the magazine Nicki am saving all the original springs also...i consider this stuff a piece of history....load up a zip lock bag, label it and pour oil in it w/ the mags...toss it in the mp40 box for my kids to find Link to comment Share on other sites More sharing options...
johnsonlmg41 Posted December 17, 2017 Report Share Posted December 17, 2017 A great solution to a problem that doesn't exist. 10% more strength is not a good thing on a magazine spring on a gun with a low rate of fire. Wolf does not have a great track record with MG replacement springs. Jams are rarely if ever the result of "worn" springs especially in the case of an MP40. Well running machine guns are a system of properly balanced parts and frictional surfaces acting upon each other synergistically . The art is to keep the balance as originally designed and the gun will keep running. Throw the balance out of whack and the odds of it working diminish accordingly. I've seen a soft shoulder kill the balance and stop the gun. I own many magazines nearing 100 years old, that all work reliably. I have others 10 years old or newer that never worked from day 1 in machine guns. Link to comment Share on other sites More sharing options...
huggytree Posted December 17, 2017 Author Report Share Posted December 17, 2017 Did a web search. Cant find any negative Wolff spring reviews. I looked specifically for mp40 springs. Who is having problems w their springs ?? Link to comment Share on other sites More sharing options...
RoscoeTurner Posted December 17, 2017 Report Share Posted December 17, 2017 Never have had a problem using original MP40 springs. No sense fixing something that isn't broke. Link to comment Share on other sites More sharing options...
azboater Posted December 18, 2017 Report Share Posted December 18, 2017 #1. I had feeding Issues with original springs #2. I then put in Wolf springs #3. The Gun (All Matching Vet Bringback FXO-41) now feeds perfectly at the correct cyclical rate #4. Any other questions or theories? Link to comment Share on other sites More sharing options...
Mike Hammer Posted December 18, 2017 Report Share Posted December 18, 2017 Hugg, As others have said, I wouldn't fool around with the original mags unless they failed to perform in the first place. If you haven't really tested them yet by firing them in the gun you could be actually creating a problem. Many replacement mag springs do not always match up to the originals. I only say this because I've run at least 25 different original mags with their original springs through my MP 38 and never had a problem with them. Mike Hammer Link to comment Share on other sites More sharing options...
huggytree Posted December 18, 2017 Author Report Share Posted December 18, 2017 thanks for the advice...i get it...ive replaced only 2....ill stop there and see how it runs 1st....should have my mp40 this week if all goes well Link to comment Share on other sites More sharing options...
colt21a Posted December 18, 2017 Report Share Posted December 18, 2017 Countdown to huggy gun. day one start now okay key the Where Eagles Dare theme music day he gets gun play Cross Of Iron.finish up with 29 round mag dump. Mg springs who gives it that much thought anymore unless you have none. Colt21A Ron Link to comment Share on other sites More sharing options...
huggytree Posted December 18, 2017 Author Report Share Posted December 18, 2017 Gun ships tomorrow. Should be test firing thurs or Friday Link to comment Share on other sites More sharing options...
Robert Henley Posted December 19, 2017 Report Share Posted December 19, 2017 #1. I had feeding Issues with original springs #2. I then put in Wolf springs #3. The Gun (All Matching Vet Bringback FXO-41) now feeds perfectly at the correct cyclical rate #4. Any other questions or theories? Excellent points. Weak springs would be a problem in any magazine IMO. The question becomes what are the condition of the springs? Maybe they are good and maybe not. Certainly try them, number your magazines (or track them in some way) and see which ones work and which ones don't work, if any, and under what conditions (keep notes if you have a number of magazines to test). If any don't work, and you suspect weak springs, put in the Wolf springs and try it. Huggytree, let us know how your testing goes. Link to comment Share on other sites More sharing options...
huggytree Posted December 19, 2017 Author Report Share Posted December 19, 2017 (edited) i carry stickers with me when testing mags...and i write what is wrong and track them.... ive been through this process before w/ bad mags... ive got 17 MP40 mags total coming......im sure some will be lemons... with my thompson i had to go through bad mags also....i setup a mag bag with 8 and i only shoot those 8...it took me 1.5 years to finally get the bad mags out of my thompson mag bag...even some that appeared to be NOS were bad....some had elongated holes (slightly) in my initial test im only planning on using the mag that comes with the gun...i would assume if any mag will run it will be the one w/ the gun...if it has issues ill move onto my others......my goal for any subgun is 1 jam per 1000 rounds....i could maybe accept 1 per 500...but i dont accept any worse....my thompson has never jammed after ive gotten the mags figured out......ive got very high expectations....but then again for what i paid ive got $$ to send it off to be tweaked....im as excited for this mp40 as i was for my thompson.... Edited December 19, 2017 by huggytree Link to comment Share on other sites More sharing options...
DZelenka Posted December 19, 2017 Report Share Posted December 19, 2017 i carry stickers with me when testing mags...and i write what is wrong and track them.... ive been through this process before w/ bad mags... ive got 17 MP40 mags total coming......im sure some will be lemons... with my thompson i had to go through bad mags also....i setup a mag bag with 8 and i only shoot those 8...it took me 1.5 years to finally get the bad mags out of my thompson mag bag...even some that appeared to be NOS were bad....some had elongated holes (slightly) in my initial test im only planning on using the mag that comes with the gun...i would assume if any mag will run it will be the one w/ the gun...if it has issues ill move onto my others......my goal for any subgun is 1 jam per 1000 rounds....i could maybe accept 1 per 500...but i dont accept any worse....my thompson has never jammed after ive gotten the mags figured out......ive got very high expectations....but then again for what i paid ive got $$ to send it off to be tweaked....im as excited for this mp40 as i was for my thompson....Unless they are Steyr magazines, some will not fit the mag well. Specifically, bte 42s are problematic. Link to comment Share on other sites More sharing options...
huggytree Posted December 20, 2017 Author Report Share Posted December 20, 2017 the 4 i have coming tomorrow are all Steyr and the 10 im getting from Floke i specifically asked for Steyr.... nice to see you back on the forum!!...youve been hiding for a while.... Link to comment Share on other sites More sharing options...
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