Take down pin problem

[JJ109]

So,

I know i going to hear that its ok to live with some play between the upper and lower receivers. Well i have dpms pattern i beleive gen 2. The play is so bad that the bolt wont catch / stay open with an accu wedge in place. Without if held down the bolt catches and stays open. Tried finding JP tension pin but they are discontinue. Open to any suggestions??????? Thanks 

[blue109]

Ouch. Is it an actual DPMS? or another brand in DPMS pattern. The Gen2 DPMS is a totally different receiver so unless you bought it as a complete DPMS G2 rifle you most likely have a first gen.

[JJ109]

Well im not 100% but its the low profile upper rail and lower fits beautiful when pushed together. Everything else functions normal. 

[JJ109]

There is a hugh gap with accu wedge in place and can clearly see day light between the receivers. 

[blue109]

Need some details to help you here. Is it factory built or home built? Bought new or second hand? Are you saying it is an actual DPMS branded rifle/receiver set (upper and lower)? Gen2 only has one rail height and it will measure out the same as the "low" DPMS but there is no high/low gen 2. It's just gen2.

Edited September 4, 2016 by blue109

[98Z5V]

Pics of rifle...

[JJ109]

Just now, 98Z5V said:

Pics of rifle...

Soon. Im not home at current moment. 

[JJ109]

1 hour ago, blue109 said:

Need some details to help you here. Is it factory built or home built? Bought new or second hand? Are you saying it is an actual DPMS branded rifle/receiver set (upper and lower)? Gen2 only has one rail height and it will measure out the same as the "low" DPMS but there is no high/low gen 2. It's just gen2.

This is a home built project.Dpms pattern.  Sota arms 18" complete upper 1/11 twist BHW SS barrel with welded/ pinned muzzle. 80% lower is DPMS pattern but not sure what brand.

[shepp]

25 minutes ago, JJ109 said:

This is a home built project.Dpms pattern.  Sota arms 18" complete upper 1/11 twist BHW SS barrel with welded/ pinned muzzle. 80% lower is DPMS pattern but not sure what brand.

Those are details that would be important, not sure how one could not remember the brand of the lower they bought but ok?

[JJ109]

yea i apologize but im not on the complete up & up. This was my first build. 

[blue109]

Guessing the 80℅ part is the source of the issue. Worst case scenario you might need to fill and re-drill the pin holes on the lower. I've seen offset pins for issues like this for AR15s, but not sure about 308s.

[JJ109]

2 minutes ago, blue109 said:

Guessing the 80℅ part is the source of the issue. Worst case scenario you might need to fill and re-drill the pin holes on the lower. I've seen offset pins for issues like this for AR15s, but not sure about 308s.

Yea i was thinking of just ordering a stripped lower but that kind of defeats the purpose. I can probably make a tension pin but was hoping to take the lazy way out. Have quite some time into this project. 

[survivalshop]

 Pivot Pin or just the Disassembly Pin or both ? You could have some over sized Pins made & fit them , but that opens up other issues . How do the Pins fit into just the Lower , are they loose ?

 This is why we recommend the same manufacturers for the Upper & Lower Receivers , Tolerance Stacking of miss matched components .

Edited September 4, 2016 by survivalshop

[washguy]

Im thinkin buy a lower and go have some fun !     The other lower mounts on the wall in the garage     Wash

[JJ109]

14 hours ago, washguy said:

Im thinkin buy a lower and go have some fun !     The other lower mounts on the wall in the garage     Wash

Yea i might still do it. But im not one to give up so easy and i like the challenge a lil bit. 

[JJ109]

19 hours ago, 98Z5V said:

Pics of rifle...

 

[JJ109]

[JJ109]

[survivalshop]

 That gap doesn't seem excessive , I would look into the travel of the Bolt Stop , maybe a burr or the Bolt Stop can be altered , if not raising high enough when activated by a Empty Mag. or Manually activated .

 Would you answer my questions about the pins , in my last post ?

[JJ109]

9 minutes ago, survivalshop said:

 That gap doesn't seem excessive , I would look into the travel of the Bolt Stop , maybe a burr or the Bolt Stop can be altered , if not raising high enough when activated by a Empty Mag. or Manually activated .

 Would you answer my questions about the pins , in my last post ?

Yea sorry for late response. Got home late. Yea pins are tight in lower. Upper lugs have little bit of play with pins 

[JJ109]

As soon as i hold down on the upper and close that gap. The bolt will catch and stay open. 

[survivalshop]

  Are you using a 308 Bolt catch or an AR 15 ?

Don't expect the Bolt Catch to hold the Bolt if no Empty mag is in place in the Mag well . It will not take much for the Bolt Catch to release if no mag in place & the Catch can be modified , as said , to add more travel to hold it in place .

Edited September 5, 2016 by survivalshop

[JJ109]

Yea mag is in. I might try buying a different bolt catch. They are cheap enough. 

[survivalshop]

Bottom one is the 308AR Bolt Catch, the top is a std AR 15 . 

  Since you have a 80% Lower , the machining may not be to spec's , the depth of the Channel for it may not be deep enough . 

 Can you manually hold the Bolt Catch in & have it hold ?

Edited September 5, 2016 by survivalshop

[JJ109]

Yea if i hold the upper down to the lower it will hold. 

Edited September 5, 2016 by JJ109