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Discussion Starter #1
Hello forum,
First post here. I have owed an SP89 for a long time now. I have purchased it about 14 years ago and fired it few times (about 200 rounds) back then with no problem what so ever. I just took it out the other day, gave it a good cleaning and took it to the range and proceeded to shoot some 115 gr. Winchester rounds, and I was getting some fail to ejects every 2 or 3 rounds. I even tried different magazines. Does anyone knows what causes such problem? Does it like specific ammo? Also, I have noticed that the spent cases have some rifling marks on them... is that normal? is the chamber on these guns rifled?

I would like to convert this pistol to an MP5 looking SBR one day, Who does such conversions? how much does it cost for such conversion (3 lug, paddle mag release stock)?
Thanks,
H.
 

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You are probably experiencing the same thing I was, which someone told me was a chamber fluting problem and the gun needs a good cleaning around the chamber area, maybe using a specific cleaner and lubricant(maybe someone else can add some info to this).

The gun does like certain ammo or more specifically doesnt like some ammo. Winchester white box especially from Walmart is of poor quality, not sure why, but the quality control just isnt there.

Also I hear most people talk about RDTS as far as conversions and work on MP5 or sp89's etc. You can call them up and ask for a price quote they seem to be very nice and accommodating.
 

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Discussion Starter #3
Great! I will try some different ammo this weekend an see what happens... any suggestions on the brand?
Any thoughts on the rifling marks on the spent cases?
 

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Rifling on spent cases is normal, I believe those are trunion marks and are caused by gas needing to escape (I think thats what I was told).....and I agree about RDTS...Ralph rebarreled and refinished my SP89 and was fair in price with excellent turn around time and customer service (although he does not like e-mails..call him). Ralph is local in Arizona and met me half way for drop off and pick up so I would not have to drive to his shop...cool guy!! I need to get my SP89 remarked and get a paddle release and he will be the one doing it. Send me your e-mail and I will send you pics. Have fun!!
 

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does it result in spent case staying in the chamber even after the
bolt has traveled rearward? do you need to tap the case out using
rod down the bbl? does a visual of the rim indicate a notch created
by the extractor as it rides over the rim as the bolt moves back upon
recoil?

i would suggest this:

- try a few rounds from other manuf ammo, be careful in keeping notes

- if you have access to own or trusted friend's reloads, try that as well

- in both cases, mic the base of the case right about the web area....
measuring before and after firing. again, keep good notes

- examine the web (just above extraction groove) after firing for visual
signs of slight shiny band.

- compare the visual and numerical of those which ejected normally vs
those cases which didn't

it's not unheard of for SP-89 and MP5 chambers to be on the tight side,
making them sensitive to case diameter, especially reloads. if this is the
cause then you should stick with new loads (not remanuf), or to run the
case through a small base die as part of your reloading process.





 

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Are you using Winchester White Box? It is known to be underpowered for SMG use.

As far as a conversion, there are several companies out there who can install the paddle mag release. As far as the barrel your options are to replace the entire barrel with a 3 lug(expensive) or have a 3 lug adaptor installed on your existing barrel. Gordon Miller at HK Specialist has C/P lowers that will fit the SP89. If you want the true PDW look you will need to pay the 200 dollar tax and get an approved Form 1 from the BATFE, then you can install the forward vertical grip and folding stock.
 

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Hello forum,
First post here. I have owed an SP89 for a long time now. I have purchased it about 14 years ago and fired it few times (about 200 rounds) back then with no problem what so ever. I just took it out the other day, gave it a good cleaning and took it to the range and proceeded to shoot some 115 gr. Winchester rounds, and I was getting some fail to ejects every 2 or 3 rounds. I even tried different magazines. Does anyone knows what causes such problem? Does it like specific ammo? Also, I have noticed that the spent cases have some rifling marks on them... is that normal? is the chamber on these guns rifled?

I would like to convert this pistol to an MP5 looking SBR one day, Who does such conversions? how much does it cost for such conversion (3 lug, paddle mag release stock)?
Thanks,
H.
All I usually shoot in My SP89/MP5K is 115 grain ammo & it works 100% with zero jams (semi & full auto) plus I use a .308 hammer spring which would make the gun more acceptable to jam. I have used Fiocchi & the Wallmart 100 round loose packed value pack both in 115 grain both with positive results. I would imagine your gun is stock & has the #16 locking piece? If so just try different ammo & clean the flutes in the chamber.
 
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