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Posted: 7/10/2021 8:49:35 PM EDT
[#1]
Quoted: i somewhat understand inertia but not really my firing pins on my new fm9's are to short can someone tell me what up here foxtrot mike isnt responding the pistols fire fine....but i dont understand how when this is......heres a video https://www.youtube.com/watch?v=HShSrE5qLac I don't understand that either...I would dissemble the fire pin from the bolt to make sure it looked ok until you get a response from Mike. |
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Posted: 7/10/2021 10:15:02 PM EDT
[#2]
With a Bic pen, fully depress the head of the firing pin into its carrier channel... then while holding it fully depressed... check to see if the tip is protruding.
If it isn't ....I'd disassemble it ... and look if the firing pin still has a tip. |
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Posted: 7/10/2021 10:21:34 PM EDT
[#3]
Quoted: i somewhat understand inertia but not really my firing pins on my new fm9's are to short can someone tell me what up here foxtrot mike isnt responding the pistols fire fine....but i dont understand how when this is......heres a video https://www.youtube.com/watch?v=HShSrE5qLac That is an inertia firing pin. If you look at most 9mm and .45 hammer fired pistols the firing pin is shorter that the hole in the slide, so when the hammer is down the firing pin does not protrude through the breech face, and rest on the primer. When the hammer under power from the hammer spring hits the firing pin it throws it forward and the inertia of its forward motion carries it into the primer with enough energy to ignite it, hence the name. In your gun, it is there as a safety measure to prevent out-of-battery firing. If the hammer falls too early it hits the cocking ramp before it hits the firing pin, and thus does not have sufficient energy to fire the primer. Not strictly necessary, but still an extra safety measure. And by the way, even blow backs can fire out-of-battery. If the primer is ignited too early, the case is not fully chambered and the side wall of the case could be blown out. |
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Posted: 7/10/2021 10:42:54 PM EDT
[#4]
all to dam confusing for me...so its unsafe to have a standard firing pin set up? i wish someone with a computer could do a how it works video
sorta like the ones on youtube...lol does this design have a tendency of not firing? sure seems like it |
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Posted: 7/10/2021 10:45:04 PM EDT
[#5]
so this is what im getting
the gas blows the bolt back throwing the firing pin further back...at that same moment the hammer slams it forward? thats how i understand it anyway |
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Posted: 7/11/2021 9:04:23 AM EDT
[#6]
Quote HistoryQuoted: so this is what im getting the gas blows the bolt back throwing the firing pin further back...at that same moment the hammer slams it forward? thats how i understand it anyway This. I believe the FM bolt is rated for FA as well.. and you don't want the FP tip exposed at all during that. Having it spring loaded and inertia driven, will avoid FP smear / drag ( ? ) on the primer... a good thing. And it is less prone to tip breakage. Also far less chance of a out of battery discharge. |
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Posted: 7/11/2021 10:41:13 AM EDT
[#7]
thanks so much foosh for your experience...i'll figure it out i guess...so what kind of firing pin do i buy as back up?
im dennis scott on facebook your welcome to join just add me thanks bro! |
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Posted: 7/13/2021 12:19:04 AM EDT
[#8]
The hammer hits the FP and transfers energy into it, driving it forward. It's like Newton's cradle, the energy propels the FP like one ball on the cradle propels the one on the far end. After the hammer hits the FP it travels out past the breech face and hits the primer, pretty much all modern hammer fired and firing pin firearms operate this way.
 Another way to think of it, have you ever hit a nail with a hammer so hard it sunk below flush with the surface of the board? Same idea. |
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Posted: 7/13/2021 12:22:16 AM EDT
[#9]
This is a good cutaway animation of a Sig pistol, watch close how after the hammer hits the FP, the pin travels forward from the inertia while the hammer stays where it fell and stopped.
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Posted: 7/14/2021 9:10:47 AM EDT
[#10]
got it guys...now the debate...grease on ar15...lol
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Posted: 7/14/2021 9:50:35 AM EDT
[#11]
Quote HistoryQuoted: got it guys...now the debate...grease on ar15...lol I have used White Lithium Grease in my buffer tubes for years... haven't had any dry out yet. YMMV, dependent on your environmental conditions. For the BCG, I use ALG Go-Juice, ( heck I use it on everything ) or I might consider the ALG Go-Juice 0000 Very Thin Grease. 9MM PCC's tend to run dirty... so the grease might turn into a grime magnet. |
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Posted: 7/14/2021 11:22:19 AM EDT
[#12]
i do have one question about f/p design....can it potentially fire slamming the bolt home on reload? seems like that design very well could
upon loading first round from a new mag |
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Posted: 7/14/2021 11:59:11 AM EDT
[#13]
Quote HistoryQuoted: i do have one question about f/p design....can it potentially fire slamming the bolt home on reload? seems like that design very well could upon loading first round from a new mag If it was going to slam fire, it would be more likely to do so on the later rounds in a magazine. 1) Since the bolt has to go behind the bolt stop when it cycles, the bolt is going to be traveling farther and faster from follow up shots that it would be from being released from the bolt stop. 2) Pressure on the rounds in the magazine is going to be less the more rounds have been fired and the magazine spring presses the rounds into the feed lips with less force. This would cause (somewhat) less drag when the round is fed into the chamber. Not sure it is the same thing, but when you reload a Garand, you sometimes have to smack the charging handle to get the first round loaded, probably a combination of these two factors, especially #1. |
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Posted: 7/14/2021 12:10:42 PM EDT
[#14]
Pull your firing pin out of the bolt. You'll notice that it has a spring around it.
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Posted: 7/14/2021 12:23:09 PM EDT
[#15]
Quote HistoryQuoted: i do have one question about f/p design....can it potentially fire slamming the bolt home on reload? seems like that design very well could upon loading first round from a new mag |
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Posted: 7/15/2021 8:14:54 PM EDT
[#16]
so had it out today just put a 1 mag thru it....4 light primer strikes out of 27 rounds click no boom...i think im dumping this thing
not impresssed with this inertia driven thing |
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Posted: 7/15/2021 8:40:28 PM EDT
[#17]
Quoted: so had it out today just put a 1 mag thru it....4 light primer strikes out of 27 rounds click no boom...i think im dumping this thing not impresssed with this inertia driven thing There's obviously something going on. What ammo are you using? Inertial firing pins are used in damn near everything. |
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Posted: 7/15/2021 9:27:24 PM EDT
[#18]
just plain ol steel case tulla...i didnt lube it up though...gonna put a few mags thru it tommorow...lube it up
it was bone dry...another question with the rails...when i aim do i aim lower? or higher?..new to these mlok handguards...right now i have no sights can seem to hit anything unless i cant see myself hitting whats a good cheap set of sights? |
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Posted: 7/16/2021 1:09:07 AM EDT
[#19]
Sounds like Tula is the problem. So you have no sights or red dot on the gun? There's no good way to aim without an aiming device.
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Posted: 7/16/2021 10:55:15 AM EDT
[#20]
Quote HistoryQuoted: so had it out today just put a 1 mag thru it....4 light primer strikes out of 27 rounds click no boom...i think im dumping this thing not impresssed with this inertia driven thing What ammo ?... Lol, Crap, I didn't read ahead. Tula Ammo has harder primers, and , frankly is pretty bottom of the barrel as far as QC. ( No Offense intended at all ) HOWEVER... Foxtrot Mikes says this in "Quick Start Guide" For function testing and leisure shooting we recommend: - Tula 115gr FMJ Steel Cased 9mm - Wolf 115gr FMJ Steel Cased 9mm Please post a pic of your firing pin. IMHO, An inexpensive RDS is money VERY well spent. The SIG Sauer Romeo 5 is a decent enough Red Dot.... Primary Arms has them on sale for a $110 bucks once in a while. A Red Dot sight is FAR faster on target then traditional rifle sights. Your eye is drawn to the Red Dot. And the RD doesn't have to be exactly aligned in the lens to hit your POA. |
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Posted: 8/29/2021 9:50:11 PM EDT
[#21]
Lube the bolt and firing pin well. Make sure the hammer spring is good too.
And use decent ammo to test it. Tula anything is "sub par" (to be generous). It may be pricier, but get some Winchester White Box 9mm to run through it. If it can't fire WWB, THEN you may have a real problem. But don't judge the gun by Tula's crappy ammo. |
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