M203Sniper
member
Is this guy full of crap? (I think he is)
Does opening and closing the doors of your car ruin the windows? Maybe if you had an old car you wouldn't let someone Slam the doors....
Is this guy full of crap? (I think he is)
Bullseye57 how did that happen? I have only seen that from folks using too light a spring with many too hot a load.
The pin hits the lug feet toward the tips instead of in the radius. The tips of the feet get damaged by the slide going to battery. The pin that holds the link in the lug begins to wallow out the hole that it's pressed into, and the interference fit is lost. The bent feet and sloppy action in the link delays linkdown timing. Incidentally, this is why letting a slide slam into battery on an empty chamber is a bad thing to do to an autopistol.
If your brass is cushioning the slide when you drop it on a loaded chamber I would check your head spacing or your brass lengh. Most auto rounds headspace on the mouth of the case not the rim.
Some years back, I had an old pistol that was ready for a rebuild, so I decided to conduct an experiment with it.
I began by using cold rolled stock to make a substitute for the slidestop pin, and fire the gun in 50-round test lots to determine how much impact was absorbed during a live-feed return to battery vs an empty slam.
Two pins were made for each test.
50 rounds revealed no deforming of the soft steel...but the pins were peened badly by dropping the slide on empty in as little as 12 cycles.
By 20 cycles, the pin was all but useless.
Going further, I drilled out the center on the pins in increments of .0156 inch...1/64th...and retesting. These holes were drilled undersized and reamed to exact dimension. By the time I had drilled a full 3/16ths
hole in each of the pins, the empty slam was destroying them in 2 or 3 cycles. The same pins continued to function during live-fire for up to 200 rounds..with minimal deformation. Understand that removing 3/16ths inch from the center of a .200 diameter pin would leave about .025 inch of wall thickness...a shell about 6 times the thickness of a sheet of 20-bond paper.
Assuming that your trigger group/fire control group hasn't been dinked with...the damage incurred is most severe at the lower lug feet. The slidestop crosspin is fairly well over-engineered and well-supported.
The lower lug feet aren't designed to absorb the repeated impact stress of a 16-ounce slide propelled by a 16-pound coil spring.
There's also the matter of the slidestop pin holes in the frame. Ever seen a pistol with the holes elongated toward the front? I have...and in guns that weren't all that old. Guess what causes that. Yep...Impact.
The question in my mind would be, how much does the act of pulling a round out of the mag and chambering it slow down the forward movement of the slide? It doesn't seem like it would slow it down all that much.
I can't believe JMB didn't take this method of closure into account.
I won't believe JMB didn't take this method of closure into account.
The guy who owns a local gun store tried to tell me today that by locking the slide open, either by hand or on an empty mag, and then pushing the slide catch/release and letting the slide slam forward that I will ruin the gun. Any gun. He made that clear, any gun at all. Said it ruins the trigger, slide, and slide catch arm.
Comparing JMB's extractor with one from a modern pistol is an apple to oranges comparison. I dont think spring steel extractors are prone to break like the "improved" modern extractors are.why not, he didn't take into account that closing the slide on a chambered round would overstress his extractor and cause it to break. as a side note: the Beretta M9/92 family have an extractor designed to close over a chambered round without damage
Comparing JMB's extractor with one from a modern pistol is an apple to oranges comparison.
“Figs. 21, 22 and 23, are respectively side, top and rear views of the combined link-pin and breech-slide-stop…”
“For easier handling the pivot-pin I is provided with a handle j which projects at right angles from the end of the pin, and extending rearward rests against the left side of the frame a when the pin is in its place, (see Figs. 1,3,21,22 and 23.)
In order to adapt the handle to be readily moved upward and downward by the thumb of the hand grasping the grip, the rear end of the handle j carries a projecting thumb piece j1. A lug j2 projects from the handle inward through an opening in the side of the frame into the top of the magazine-seat …”
[emphasis added]“…the follower will raise the lug j2 and the handle j and cause the projection l to enter the recess m in the breech-slide, thereby locking the same in the open rear position, and serving as an indicator to show that the empty magazine must be replaced by a charged one before the firing can be continued. After placing the magazine in the grip the breech-slide is released by depressing the handle j.”