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jrdoran

Improvement on Stern Defense mag adapter

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About to build a competition PCC using a pre-ban lower here in CT.   While I heard good things about the Stern mag adapter, the mag release button sucks and seems incomplete in design, but I don't have a better answer on how to improve. 

 

Anyone have a point of view on how it can be improved or if there is a better answer than the clunky button in front of trigger finger that must be pressed forward in order to drop the mag. 

 

https://getstern.com/mag-ad9/

 

image.thumb.png.d17dbae2e43b818961662077e72eac5f.png

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Have you bought the adapter yet? If not check out the PSA adapter. It’s an all aluminum adapter that has the mag release in the front and is shaped like a curved trigger. All the reviews seem to say it works good and is well made.


https://palmettostatearmory.com/psa-custom-9mm-glock-compatible-mag-well-conversion-block.html


Sent from my iPhone using Tapatalk

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Posted (edited)

I haven't purchased it yet.   The PSA adapter seems interesting and is a different approach to mag catch.    Anyone else have hands on experience with the PSA adapter ?

 

I should add that I am a left handed shooter so the Stern seems particularly difficult to actuate for safe / fast mag changes; 

Edited by jrdoran

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How is PSA conversion better? It required your weak hand to hit the release!

I have a Stern Defense kit on my carbine, you just need to get use to the mag release button.

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For a left handed shooter, the Stern Defense is clearly not a good option.   

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Make yourself a lever that spans to the other side so you can use your trigger finger.

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19 hours ago, Scooter said:

Make yourself a lever that spans to the other side so you can use your trigger finger.

 

I really like this idea ( I could even weld it to the existing lever ).  I don't have a mag adapter in hand, but my question is how much lateral sideways force on the lever is OK.  Will the mag drop lever still function OK if I have it extended to span to the left side ? 

 

Hard to explain but you hopefully get the drift that today the level is a direct push back, with the sideways span it will have some lateral force put on ejection lever, dunno if that is an issue or not ?   

 

 

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23 hours ago, jrdoran said:

 

I really like this idea ( I could even weld it to the existing lever ).  I don't have a mag adapter in hand, but my question is how much lateral sideways force on the lever is OK.  Will the mag drop lever still function OK if I have it extended to span to the left side ? 

 

Hard to explain but you hopefully get the drift that today the level is a direct push back, with the sideways span it will have some lateral force put on ejection lever, dunno if that is an issue or not ?   

 

 

 

I don't think it would be an issue since the mag release rides in a slot almost the full length. I'll check with the extra one I have whether it would work out not.

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On 8/3/2020 at 10:36 AM, jrdoran said:

 

I really like this idea ( I could even weld it to the existing lever ).  I don't have a mag adapter in hand, but my question is how much lateral sideways force on the lever is OK.  Will the mag drop lever still function OK if I have it extended to span to the left side ? 

 

Hard to explain but you hopefully get the drift that today the level is a direct push back, with the sideways span it will have some lateral force put on ejection lever, dunno if that is an issue or not ?   

 

 

 

Just extend the button higher and get use to it. Instead of press now is push with your trigger finger.

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How is PSA conversion better? It required your weak hand to hit the release!

I have a Stern Defense kit on my carbine, you just need to get use to the mag release button.

I wasn’t saying the PSA was better or worse, I was just throwing out other options. I don’t own either as I have a dedicated lower. I didn’t realize you could reach the mag release with your strong hand. I thought both required weak hand to grab mag/use thumb to release mag or grab and pull trigger like on the PSA.

 

 

Sent from my iPhone using Tapatalk

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On 7/31/2020 at 10:49 PM, jrdoran said:

About to build a competition PCC using a pre-ban lower here in CT.   While I heard good things about the Stern mag adapter, the mag release button sucks and seems incomplete in design, but I don't have a better answer on how to improve. 

 

I recently finished building my first PCC AR with a generic lower (which takes a STANAG 556 mags) and the Stern mag adapter. I figured I wanted to dabble in PCC but didn't want to invest too much for just trying out.

 

Pros:

- Easy to install, easy to remove, easy to clean

- Super reliable, I've even tried the flattest ugliest flat nose I can find and it would still feed

- Mags drop free (tried ETS 40 rounders, Glock 33 rounders, G19 mags, PMAG 19/17/21)

- Last Round Bolt Hold Open

 

Cons:

- The mag release button location, which to me a non-issue. I just had to practice reloading for the stages that requires mandatory reloads, which are not many to begin with, probably 1 stage per match? Took it to a match and scored 56% on CM 18-09, and I can tell you it wasn't the releasing the mag that slowed me down. 😆

 

For the rest of the "freestyle" stages, it's really really a non-issue, unless it requires more than 41 rounds, since I don't have a long stick with extensions.

 

 

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6 hours ago, jerseyglock said:

 

Just extend the button higher and get use to it. Instead of press now is push with your trigger finger.

OP is left handed. 

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On 8/3/2020 at 7:36 AM, jrdoran said:

 

I really like this idea ( I could even weld it to the existing lever ).  I don't have a mag adapter in hand, but my question is how much lateral sideways force on the lever is OK.  Will the mag drop lever still function OK if I have it extended to span to the left side ? 

 

Hard to explain but you hopefully get the drift that today the level is a direct push back, with the sideways span it will have some lateral force put on ejection lever, dunno if that is an issue or not ?   

 

 

 

So I 3D printed a lever that fits over the Stern's mag release button and spans to the other side as a test. Works fine, no binding.

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29 minutes ago, Scooter said:

 

So I 3D printed a lever that fits over the Stern's mag release button and spans to the other side as a test. Works fine, no binding.

 

Can you post pic?

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That looks great.   Interesting, one  could vary thickness to accommodate different trigger finger lengths, etc;    Could you take a pic of the backside on how the lever slips onto the existing tab ? 

Edited by jrdoran

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45 minutes ago, jrdoran said:

Could you take a pic of the backside on how the lever slips onto the existing tab ? 

This was just a proof of concept to see if the lever would bind. The lever simply slipped over the top. I wouldn't make it the same way if I was making a lever for myself. 

 

Though I'm now intrigue to make one to make the gun ambidextrous. My would be different to clear my large magwell.

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