Finally we can Post
Hello Everyone, this is Paul from NDZ Performance. I’m sorry I could not get on here sooner we just created our account and had to wait for approval before posting.
We just got approval to post today at 7:01 AM.
We are currently looking into the issues that are coming up with the SBR.
Let me first say that we stand behind our products 100% and they all have a Lifetime Warranty against Material and/or Manufacturing Defects.
We will get the issue resolved regardless.
At this time let us address all problems the best we can.
We would like to clarify that a stock gun without our SBR installed can have the tendency to release the bolt if you bump the gun or Slam a magazine home. We have tried it numerous times on two different guns with the same result.
We took the spring out of one of our magazines so the follower would not engage the Bolt Catch and slammed the magazine home without the SBR and it will release the bolt almost every time. The weight of our current SBR is 8 Grams the same as a Bad lever.
The added weight of the SBR might make this happen slightly easier but this is still an issue regardless if you have an SBR installed or not.
Has anyone that bent and installed a Bad lever experienced any of the related problems?
The Last round Hold open Problem Could be related to:
1: weakened Magazine Springs from really used magazines. We have 4 magazines here for our gun and tried them all with no issues. This gun has had about 2000 rounds through it.
2: The surface contact between the bolt and the bolt catch is a wearable surface contact area. Worn surface areas can cause the bolt catch mechanism to be more easily activated.
3: After further investigating this morning we have noticed that our SBR can come in contact with the body reducing the travel by .010-.015. This may have an effect on the hold open depending on the Contact surface area of the Bolt and Bolt Catch.
Just to be safe we have already modified that area on one here for testing to fix that, and this modification will be added to all the new SBR’s in production. Any one with our current SBR that is experiencing this issue Please call us 203-439-7784 so we can modify your current SBR or replace it.
Someone mentioned about the Play in the SBR there really is no play in the SBR. The play is actually in the Bolt Catch but by adding the SBR it makes it more evident which might lead someone to think there is play in the SBR. If you take the SBR off, and just look at the Bolt Catch, all the play will still be there.
To sum it up:
Weight may have an effect on the last shot bolt open (we will address this in future runs)
Worn bolt and bolt catch
Weak mag springs
Body to SBR lever clearance (we made the modification)
So here is the deal. Please don’t worry we stand behind all our products and will take care of this the best we can. As soon as we get any more information I will update and post on here. In the meantime any feedback from you guys will be greatly appreciated.
I can be reached via Email at
[email protected]
Or you can call me at 203-439-7784 M-F 8-4 EST
UPDATE as of 7-12-12
Ok So I wrote this a week ago and I went again to the range yesterday. I have to say we are a bit puzzled because the problem seems to be with only some of the SBR’s not all.
If it was with all it may have been easier to identify and fix.
I tested my gun with some different mags from a friend and I did experience some failure on last shot hold open. Some mags fair better than others. So it seems to be a combination of things mostly it is the Mag springs have different spring tension tolerances.
I used some Allen wrenches and rigged my mag springs so they had more pressure and it held open every time.
Were we stand now is It has to be a weight issue combined with the spring tension.
So we are in the process of making it lighter we have removed 2 grams now and as soon as I can I will get to the range hopefully Today or Tomorrow and run some new testing.
We thank you all for being patient and am sorry for any inconvenience this may have caused.
We will keep you updated and like I said before We stand behind all of our products.
Feel free to contact me through email. Or by phone or on here and we will get you takend care of.
Special Thanks for the support from PMBSPYDER, w0ady, PapaChop, Aceman58,
PHXSHOTER, Juvicator, and Kayback and anyone else I may have missed.