Ultradot changed. Can't screw extension tube in rear

I wanted another 30mm UD.  Ordered MD and received it. 

Aarrggh!

The rear end is now not threaded the same to fit the extension tube. 
That's what I wanted.  Double aarrggh...  

Reason?  I knew you would ask.
With the extension tube on the rear and a silver end ring added, you get the concentric circle sight picture that Dr Wong described some time back.

I use lobster claw rubber band on back of ultra dot to get circle affect

Try the yellow rubber band because the eye is most sensitive to the yellow wavelength.  I would bring a bunch for Bud Bonner in the past when I saw him at Camp Perry and he preferred the red color.  I didn't care for the blue or green.

I hope you find the humor when Bud and I called the rubber band as the "concentric ring, anti-parallax red dot scope enhancer."  Simple, free and effective but the fun part is eating the lobster.  I celebrated with a 7 pound lobster when I legged out.  The waiters thought I was crazy when I wanted to keep the rubber bands.

be a hit with all your friends and hand them out like candy 500 bag cheap

http://www.amazon.com/JCS-Lobster-Bands-About-Orange/dp/B00MOT6FAE/ref=sr_1_1?ie=UTF8&qid=1435421806&sr=8-1&keywords=lobster+claw+bands&pebp=1435421812190&perid=1N3JSG2QQYKS6PJHECQK