OMMV, but the one time you should hand-hold the slide down
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Well said Rob..
To the OP:
Whichever method of slide release you choose, may I strongly suggest "when gun is disassembled for inspection, cleaning, reassembly", that you "never use the slide lock release lever" to close the slide after you have finished putting your gun back together.
I say this only because, after reading about a fellow forum member who "always used the slide lock lever and one time he forgot to put the dissasembly lever back into locked position and hit the slide lock release and watched, in horror as his slide went airborne, flew quite a ways and landed on hard ground putting some ugly (un-needed) scratches on his, otherwise, flawless gun/slide.
Me, I use the slide lock release lever at the range 90% of the time, as IMHO, as others have stated, it allows one a stronger, 2-hand grip, point to aim, ability for faster on target shot but, more importantly, it also will aid "tremendously (having a 2-hand grip) IF, for any reason one's firing pin sticks (out) gets stuck and once the slide is released, whether by hand, or by slide lock release lever, the 2-hand grip will afford far better control over a one handed full auto, thru 7, 8, 10, or more mag-full loads over a one handed grip.
As, with one hand grip, the gun "will" fly over the top or swing in a half circle if gun is semi sideways and that "uncontrolled travel" via one handed grip, can have dire effects on one's surroundings vs 2-hand grip and gun pointing downrange and can be held, at worst, shooting straight up, but not at any one behind you or to your side..
Last point, as I laughed about the guys forgetting to lock up his gun, knowing it would never happen to me because in all my years of disassembly, inspections, cleanings, and reassembles, I've always held the slide and then hitting the slide-lock release lever and let the slide down easy by hand.. (on an empty mag or chamber, only) not for loading live ammo, or even a snap cap FTR.
Not long ago, not thinking about his story, and somewhere in my nothing-box, after cleaning one of my Sig P229's, I just hit the slide lock release lever (for the first time, only time) and
watched my slide go flying (I forgot to put the lock lever back up) and luckily, had the gun pointing semi- down at the carpeted floor of my home office, and not at a wall or the window, as they have enough force to put a nice dent in a wall or go thru a glass window..
When it happened, I heard that fellow forum member, and many others, looking down at me, laughing, as I looked up at that exact moment
as if (in astonishment) to acknowledge "the warning" I read in his testimony and the one_time lapse in my, once-only, moment of change from the way I had always before, and since, using the "one time" hand-hold the slide down gently anytime I open up a gun and then put it back together for any total, break-down, inspections, and verify, locked, all is good to go..
Ls