EVO accessories

[TheLocNar]

Anyone know if the adjustable LPA sights come with 4 apertures as well?

[Nimdabew]

When you install the end plate on the AR, it helps with the alignment, but it spins with the stock as you're screwing it on and still allows some movement as you're tightening that castle nut down...  That's why primary weapons offers their $100+ buffer tubes that clamp on...  Don't think those would work here though... http://primaryweapons.com/accessories/buffertubes/

(I actually prefer the POF tube, though it's n/a for the EVO...  http://www.brownells.com/rifle-parts/receiver-parts/buffer-tube-parts/buffer-tubes/ar-15-m16-anti-tilt-buffer-tube-prod64568.aspx )

So I don't really see how this would be different.  Regardless, you'd just want to ensure it's properly aligned before and as you you tighten the castle nut down.  I think AR torque specs is around 40 ft lbs if I recall correctly.  And then stake castle nuts too...

That's not what I am talking about. I have built a lot of AR's, and the pistol buffer tube end plate doesn't have anywhere to mate up to. Look at 7:45 and beyond in this video. It is just a flange for the threads and no end plate mating surface. Unless the threads are pre matched for ending right as the receiver extension is true, then the stock will be slightly to the side when tightened.

CZ Scorpion EVO 3 S1 Pistol Review (HD): http://youtu.be/dXir_jeNkU4

[RSR]

It looks like the pistol tube they use might be proprietary.  And usually there's no correct up or down...  And it looks like that wider part serves as the castle nut... 

On a rifle AR tube, you'd put on the castle nut, screw in as far as possible while allowing the bottom to face directly down and tighten the castle nut...  On ARs w/o the buffer tube retaining pin or if you push it down, you can screw that in too until you run out of threads... You would control alignment through the castle nut, not a thread synchronization...

[armoredman]

Nice video, sir...wish I had one so I could do a video too. That thing just looks like so much fun to play with!

[Nimdabew]

It looks like the pistol tube they use might be proprietary.  And usually there's no correct up or down...  And it looks like that wider part serves as the castle nut... 

On a rifle AR tube, you'd put on the castle nut, screw in as far as possible while allowing the bottom to face directly down and tighten the castle nut...  On ARs w/o the buffer tube retaining pin or if you push it down, you can screw that in too until you run out of threads... You would control alignment through the castle nut, not a thread synchronization...

That is not how the AR receiver extension works. You thread the tube into the receiver until the buffer detent is captured by the tube and then use the receiver end plate to keep the receiver extension aligned with the receiver through the channeled groove in the threads. That is the part that the sig arm brace adaptor doesn't have. The castle nut just engages in this order: receiver/receiver extension/receiver end plate/castle nut. The receiver end plate is important when tightening the receiver extension down and for alignment purposes.

[RSR]

Neither the end plate nor the buffer detent keeps it perfectly square/vertical.  The buffer retainer just tells you the maximum you can screw in, but there is variance in threading so it's an interplay between the retaining plate and buffer retainer. 

The only way to keep it perfectly square is w/ your castle nut install...    It's probably what, a 1/4" to 1/3" groove you're referencing on the AR tube and the end plate prong that inserts into that doesn't take up the whole channel, which means a minimum 1/8" out of perfect if you just rely on the end plate to be close enough...  That's why the longer range AR guys pay 10x more than the a standard buffer tube is worth for the PWS ones that allow for a more perfect and easier vertical. 

Point is, I align my buffer tubes in perfect horizontal when torquing the castle nut and consider the end plate to just be a ballpark.  So the EVO AR tube adapter for me is a non-issue.  YMMV.

[Charlie-2-6]

Anyone know if the adjustable LPA sights come with 4 apertures as well?<br/>
Negative, only 1 aperture

[TheLocNar]

Anyone know if the adjustable LPA sights come with 4 apertures as well?<br/>
Negative, only 1 aperture

Thank you for the info Charlie! I may just put some white paint/nail polish on the front peg then.

[RSR]

Trajectory for Sub2k -- Evo should be close.  9mm is pretty flat to 100 yards:



EDIT: Should note Sub2k is 16" barrel vs Evo's 8".
According to ballistics by the inch you're looking at an ~75 fps difference -- or 8" has ~95% of the velocity of 16": http://ballisticsbytheinch.com/9luger.html

Using ballisticsbytheinch's 8" barrell velocity #s and otherwise using gundata's preloaded cartridge ballistic info (just picked two that were in both), here's the trajectory chart for 2 115gr options:


And here's the Ballistic chart -- and I did these at a 100 yard zero:

[ccjcc81]

Great chart!  The buffer tube adapter and 30 round magazines are for sale now at the website.

[armoredman]

Yep, and MUCH faster than we thought they would be.

[Charlie-2-6]

Thank you for the info Charlie! I may just put some white paint/nail polish on the front peg then.

No need for that, the (euro) LPA frontsight already has a white dot

[TheLocNar]

Thank you for the info Charlie! I may just put some white paint/nail polish on the front peg then.

No need for that, the (euro) LPA frontsight already has a white dot

Oh, I was talking about the stock sight. My bad!

[CitizenPete]

Great chart!  The buffer tube adapter and 30 round magazines are for sale now at the website.

Can you lease post a link?  I search the store and site, but I am somehow missing it.

[armoredman]

http://shop.cz-usa.com/cz-products/scorpion-evo-3-s1-pistol

It appears they may have actually sold OUT of the 30 rounders, as in 300 magazines sold in less than 10 hours! Wowza.