Warning: Avoid PDI 150% springs

[CDN_Stalker]

Honestly, I swear that PDI is low on stock, so they send out all the practice springs that new employees practice making!

In the past 7 or 8 months I've been working on team guns and a few other local players guns, and have installed (or attempted to install) mostly PDI 150% springs, and they are getting BAD! Not only are they too long (7") but they are made of thicker wire (eyeballing looks like 0.5mm thicker.)

The PDI spring I have in my MP5 is a PDI Pro 150%, came in a box as opposed to a bag like all others are now, it measures 6 3/8" long and shoots 350fps (370fps now with the bearing spring guide I installed). This is a good 150% spring. Others that have been installed, and those that I didn't install, are shooting between 390fps and 450fps with .2g BBs. I've found that for the most part, these springs are a royal bitch to install, have had some even bend out of shape trying to compress it. Even one I tried to install in my MP5 I found it impossible, ended up gradually cutting an inch of length off it, got it installed, but was still so strong that it overran my anti-reversal latch!!!

Anyways, point of this being, don't buy the PDI 150% springs anymore, and retailers should measure the length and send back any that are too much. Sure you might get a huge fps boost, but is it worth it? (NOTE: I had my true PDI 150% spring in my MP5 for a couple months, ran about 3000-4000 BBs through it, then my stock mechbox blew the end off. If this happened to me with my mild spring, what do you think a super strong spring will do?)

[firemachine69]

Blown up parts are just an excuse to upgrade.

[sherlockbonez]

Has anyone tried non-150s? I have tried a few sets of PDI springs from 120 to the 170 that I'm running now, and never had any problems with them.

[SINN]

My G&P came with a 170, so I ordered a 150 to replace it. I was shooting over 420 with the 170. Pulled out the 150 and it was waaay longer and harder than the 170. Ended up putting a PDI 140 in, and dropped the FPS down to 360.

Thanks poncho :roll:

[rat]

the PDI 150% problem has been an issue for the past while. substitute with a M100 or M120 spring.

btw: i received a faulty pdi 150 spring as well....way too powerfull...also, bruce informed me that many others were getting these mislabelled springs as well.

[CDN_Stalker]

PDI 170% sprigs are shorter anyways, but for the most part I haven't experienced any BS from them, they are super easy to install, and only heard of one local account of a 170% spring shooting 450fps.

I pretty much just posted this because I got Jackal's new M4 last night to upgrade and saw the sprinng he got was a 150% and measured it, sure enough it was 7" and thick wire, so I let him know and what could happen (busted mechbox within a short time) and he promptly ordered a (recommended by me) Prometheus 120 or something from Illusion. Just that every 150% spring I've seen in the past 6 months have been too long, too thick ad too hard to install.

I managed to get mine in without any problems.

note, after lots of use, the 150% fps will drop to a reasonable level. run a few thousand softair BBs through it, be at 400 in no time.

[BC_K]

I've used PDI 150's in MANY of my guns. NEVER had a problem with them.

Guess you've just had shitty luck.

[Ghost Snake]

I have a pdi 130% right now in my G36c. Same thing, way too long. And it bent when I tried to compress it. I dont have a chrono, but I'm pretty sure its shooting way faster than it should be.

[666]

Ghost Snake, there was a warning about mispackaged PDI130's long time ago. I guess they still place harder springs in 130s packaging.
My PDI150 with updraded spring guide, bushings and tight bore clocks at 400. 407 was the highest it ever showed.
P.S 150 did come in the bag instead of the box, that was about a year ago.

[Darklen]

Got mine in a bag too. Every gun I've put it in won't even compress it. Found out it's too big to even fit inside the piston. I tried a stock TM, Prometheus, Systema & Deep Fire and it is physically too large to fit inside the piston but a mm or so.

[Kane]

It seems like PDI's quality control is simply slipping... I've had a PDI 150 in my MP5 now for a few years without any problems. Save for the cracked box, but that was to be expected. A CA reinforced box quickly fixed that problem. Probably best now to just stick with TOP or Promethus springs; Systema in a pinch, lol!

[vondnik]

I had to deal with PDI springs for some time now.... 90% are shit.... I've seen PDI 150 shooting 480 fps, PDI 170 shooting 350 and PDI 120 going for the 400.... Lenght wise they are all over the place it's not even funny...I've seen a 1 inch variant betwine two pdi 150 ( that i bought at the same time and from the same distributer)this is over the course of 2 years. I've had nothing but issues with them and was never satisfied with the results they gave out in my guns. Lately it's only getting worst. I still ownder why people buy them... I guess it's a bit like CA...beats me.....You know they are shit, it's been proven and said many times but they still sell. I've switched all my guns (14 of them) to guarder springs except in my thompson that runs and TOp power and the RPK that runs a m120s.