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Discussion Starter #1 (Edited)
I've got a XD(m) Elite OSP 4.5 9mm with a Trijicon RMR RM07, Streamlight TLR-1 HL and a Springer Precision Shorty Compensator. (See Picture).

Ammo Used: Midwest Ammunition 115gr FMJ

I found out that a compensator needs a reduced power spring. I shot it with the stock spring of 18 lb and the slide is not going back enough to eject the spent casing and the slide is catching it getting pinched. I read should I use a 14 lb spring. I purchased a guide rod and a 14 lb spring from Wolff Gunsprings and it is still doing the exact thing. I also purchased a 16 lb spring but doubt that will do anything since the 14 lb doesn't work. The next unspent round casing is getting scratched as well.

I took off the light to see if the weight towards the front would affect anything. First shot it jammed.
Could the weight of the reflex add to the issue?

I am out of ideas on what to do. I presume that compensator is no good with this gun or I should try different ammo but not sure what grain to use. I'd like second opinions.

Attached is a picture of the setup and a basic idea of the short cycling but imagine the next round getting stuck along with the casing.
 

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I'm not familiar with Midwest ammunition....so looked it up. If the specs are accurate, should be fine. Sounds like you've covered all your bases. I'd get in touch with SP and get their thoughts. If it works without the comp and doesn't work with it then they should be able to help. I wonder if the weight of the rmr makes any difference? Maybe drop to the 14 lb spring and see what happens. At least you can check that idea off the list if it doesn't work.

I just put the same comp on my XDM 45 acp (no rmr) and have, so far, flawless function. Worked fine with the stock 18 lb spring, and the 16 lb wolff spring. Granted, 45 is not 9mm.

Let us know what you get figured out, please.
 

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It's worth trying some well known, factory ammo as well. And there's always the "let another experienced shooter shoot it" to see if it's operator related.
 

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Midwest Ammo is one of the worst ammos this side of hell. It's a local company that supplies all the local ranges around here. They use it mainly for their rentable firearms... and to undercut the price of the name brand stuff. Mention this garbage around these parts and it's just one bad story after another. Run a mag of this stuff through your gun... and then a good quality brand ammo... the difference is night and day... this stuff is way underpowered.
 

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I'd try different ammo, first.

Any gun with any aftermarket compensator can be finicky. The "Roland Special" has gained tremendous popularity among tactical/defensive/duty Glock shooters as of the last 5 years or so, and they're known for needing to be self-vetted for ammo compatibility after assembly.

When my buddy completed his Roland Special build, we were both somewhat worried about the supposed ammo-finickiness of that setup.

To insure that we wouldn't waste a range trip, I brought out with me sixteen different makes/models of factory ammo - both el-cheapo range-fodder as well as premium defensive/duty cartridges - to give the gun both some good exercise as well as to log some data for ourselves.

To our astonishment, the gun performed just about the same with 15 of the 16 different 9x19 cartridges - everything from 115 gr. to 147 gr., standard pressure and +P.

Out of the bunch, only 147 gr. aluminum-cased Blazer, for whatever reason, caused it to literally open its group size to double what we saw with any of the other ammo (this was 10 shots at 22 yards - which was as far as the range allowed us to push the targets back to - shot freestyle, at a pace of about a shot every 1.5 to 2 seconds). The gun shot both 115 and 124 gr. Blazer aluminum just fine, and it also shot various other 147 gr. ammo (including both Speer GDHP and Federal HST) just fine, too. Literally, everything was fist-sized with the exception of the 147 gr. Blazer aluminum, which became hand-sized. We even re-tested, just to be sure.

Sometimes, there's just weird unique-gun to unique-ammo issues. Maybe this particular gun of yours just doesn't like this particular make/model of ammo for whatever reason. To-wit, one of my two 4.5-inch XDms just doesn't like Magtech's 115 gr. range-fodder. Tolerance-stacking is a real phenomenon.

Typically, comp'ed guns work best with higher pressure ammo, and may even require higher-pressure ammo during break-in; the shorter/lighter range-fodder may not have sufficient "oomph." After the gun settles into its rhythm, fine-tuning of load or commercial ammo selection can then begin.
 

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Just for comparison, buddy of mine have a Rex Silentium Glompensator on his XD-m Elite. We ran 5 mags full on it with 115gr FMJ Red Army steel case on stock springs with no hiccups. His set up is with Holosun 507c and Streamlight TLR-1 HL.
 

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I have the exact same XD M 4.5" 9mm OSP, same Trijicon site, slightly smaller TRL 8 light. I just bought the SP brake and lighter springs and waiting for them to be delivered. I'll let you know my experiences. I have a stock pile of Speer Gold Dot 115, PMC FMJ 115s and Federal HST Tac 147s.
 

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I've got a XD(m) Elite OSP 4.5 9mm with a Trijicon RMR RM07, Streamlight TLR-1 HL and a Springer Precision Shorty Compensator. (See Picture).

Ammo Used: Midwest Ammunition 115gr FMJ

I found out that a compensator needs a reduced power spring. I shot it with the stock spring of 18 lb and the slide is not going back enough to eject the spent casing and the slide is catching it getting pinched. I read should I use a 14 lb spring. I purchased a guide rod and a 14 lb spring from Wolff Gunsprings and it is still doing the exact thing. I also purchased a 16 lb spring but doubt that will do anything since the 14 lb doesn't work. The next unspent round casing is getting scratched as well.

I took off the light to see if the weight towards the front would affect anything. First shot it jammed.
Could the weight of the reflex add to the issue?

I am out of ideas on what to do. I presume that compensator is no good with this gun or I should try different ammo but not sure what grain to use. I'd like second opinions.

Attached is a picture of the setup and a basic idea of the short cycling but imagine the next round getting stuck along with the casing.
I've got a XD(m) Elite OSP 4.5 9mm with a Trijicon RMR RM07, Streamlight TLR-1 HL and a Springer Precision Shorty Compensator. (See Picture).

Ammo Used: Midwest Ammunition 115gr FMJ

I found out that a compensator needs a reduced power spring. I shot it with the stock spring of 18 lb and the slide is not going back enough to eject the spent casing and the slide is catching it getting pinched. I read should I use a 14 lb spring. I purchased a guide rod and a 14 lb spring from Wolff Gunsprings and it is still doing the exact thing. I also purchased a 16 lb spring but doubt that will do anything since the 14 lb doesn't work. The next unspent round casing is getting scratched as well.

I took off the light to see if the weight towards the front would affect anything. First shot it jammed.
Could the weight of the reflex add to the issue?

I am out of ideas on what to do. I presume that compensator is no good with this gun or I should try different ammo but not sure what grain to use. I'd like second opinions.

Attached is a picture of the setup and a basic idea of the short cycling but imagine the next round getting stuck along with the casing.
It may be just the ammo I have the same 4.5 elite with the same compensator and had no problems with the stock recoil spring with Blazer brass 115gr, Norma 115gr and Federal 147gr.
20200614_114853.jpg
 

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I’d say it’s the ammo—try something different, preferably hotter...

Otherwise, see if it runs without the computer; if it does, the problem has likely been identified.
 
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