Another possibility is upside down battery.

Another possibility is upside down battery.

This happened to me as the tray is very snug for my Holosun. So when I popped it out, IDK which way the batter was because it flipped like a coin.

Separate topic, but you can setup double feeds as well.  In a SB a LONNNGGG time ago, your partner has to setup your mags.  General intent was 2 randomly spaced casings inserted to simulate double feed to occur randomly in a COF.  My partner happened to put like 4-5 in one mag. . . ended up being during the portion of the COF where I was at the bottom of the VTAC. . . evil. . . I could hear them laughing. . .   

   We do one called "F" your buddy where buddy loads mags and tosses in a couple snap caps randomly and inserts in your holstered firearm.
Tap and rack dance.
Some "buddys" will fill the whole mag with dummy's, but after 3 or more, I automatically change mags

    I like iron sights but I (or should I say my eyes) finally broke down for the dot on my HDS.
G19 with light and holosun, it does not conceal well on my slim    figure for CC.
I do well with my smaller frames from concealed but usually don't go anywhere, maybe town once or twice a month and feel the CC need more when returning home and entering my house.

  My range bag always has extra battery's for all equipment that requires them, including ears, but I've given them more to others than needed myself.

   Our qaul times are all under 2.5 up to 7 yards (one guy under 1.5 but he's an alien),  around 5 sec @ 10 yds and a hair over that from 15yds (alien is faster).
USUALLY 100% or 10 points off if trying to push it.
Have not shot test with HD gun yet but will this weekend.

Which Holosun did you end up going with?  407

Does the alien's name start with D? 
Yeah, but I call him "Otto"
I think the last time we were with you was with BB and while I was at truck checking equipment, HPD showed up for  "Someone firing full "Otto" 

re:Otto

Ya.  Those were some great range days. 

For your CC, what light?  Dot is 407K, right?  I have CC'ed a 17 with X300U/T and Acro.  I've lost quite a bit of weight since you last saw me, but still not "trim" like you.  I typically cc a 17.5 with EPS and TLR7A.

   No light on CC, I don't travel out at night.
Besides, with my trim figure, would be hard to conceal. 
Working the G43 and S & W Airweight

   TLR 7 on HD G19 with Holosun 407.

Yeah, saw a recent pic of "less" of you, bet that feels better, but now you can't use your belly to convert your IWB holster into a level 2 holster.   

Trained on a VTAC barrier with a red dot yesterday.  It is so much easier and can be more accurate and quicker as your eye can be slightly out of alignment with the bore or the gun rotated.  Like rotating the gun 90 degrees.  It can be done with irons, but more difficult and slower to do.

I got a TLR7 on my Glock 48.  Doesn't add much to the size.

But like night sights, weapon mounted lights have a relatively small set of circumstances where they would be used. And majority of civilian CCWers don't train the proper use of them.

Didn't put holes in the barrier, but there are plenty holes in barriers that have been "signed". 

No lie, get your sig all over the wood.