Make sure you also purchase the MP5SD 9mm Barrel Port Brush and handle as you will need it to clean your SD.

 

For completeness' sake, the options I chose with my Hi Tec conversion were:

• MKE AP5-SD conversion with the RCM HK MP5SD 9mm Barrel - Ported Threaded 18x1
• Universal Cocking Tube Support upgrade

Hi Tec received my AP5-SD today [confirmed via Fedex]

 

I had some growing pains with my HTA converted AP5SD but it runs really well now. I had it out this past weekend and put 300 rounds through it without a single issue and that was with a Leber lower and Super Safety. My SD is now my favorite rifle to shoot

 

Do you recall what issues you ran into/ what you needed to do to fix them?

 

I had FTE and double feeds during and after the break in period. I thought it may be mag related so I bought a HK mag and was still having FTEs. So I replaced the extractor, extractor spring and the ejector with HK parts and it started working. It was a whole other bunch of tweaks to get it to run with a super safety but thats another story.

 

Can you give me a general idea of what this conversion cost you (without the can)? I was told at a knowledgeable LGS a price which matched some of what I saw on the HTA site, but then it looks like that price is not actually everything you need (besides the can) to convert it.

Thanks,
Brian

 

Can you give me a general idea of what this conversion cost you (without the can)? I was told at a knowledgeable LGS a price which matched some of what I saw on the HTA site, but then it looks like that price is not actually everything you need (besides the can) to convert it.

Thanks,
Brian

You need your barrel removed and a ported barrel installed w the right locking piece... the Century AP5-SD looks like an SD and has the bones of an SD but without the ported barrel and correct locking piece for it to run, it is not.

The porting at the base of the barrel bleeds gases when a supersonic 9mm (typically 115gr/ 124gr) round is ignited so that the round slows below the speed of sound (which is 1125 fps at 68degF, changes depending on ambient temp). Subsonic rounds dont have that crack heard even when fired through a suppressor - which mitigates muzzle blast but not the sound signature of the bullet traveling in the air.

If you buy a stock AP5-SD you can put a can on it but would need to buy 147gr+ 9mm rounds to achieve the same result of the SD.

The prices varies but avg conversion price is approx $1K +/- $200 - there might be other things your clone needs as the builder tears into it. Also some builders has faster turnaround times - which matters more for some ppl. The work involves cutting and reattaching metal via welding, headspacing and setting pieces to spec, pins, refinishing etc. If you are handy you can do it but I preferred to use a builder that does these all day, every day on my $1300+ donor gun - to make sure it is done right.

Buying a premade HTA converted clone would have costed me approx $500 more than what Im doing - and that depends on the price of thr donor AP5-SD

 

The worst part of doing these conversions is the barrel pin has to be machined out. I do them all the time (don’t a couple today actually)

The AP5SD guns are hit or miss as far as the quality goes. I’ve had some that came in perfect and others I had to do alot of work to get the cages back in alignment.

 

Grease Gunner did mine and it is truly awesome. Should have had him make it sear ready but didn't think about it. Mine has run flawless regular and with a sear pack. Added a bolt with removable trip because of my brain fart.
It is definitely one of the coolest guns I own.

 

My HTA has run perfectly and there customer service is excellent if you have any questions about your purchase.

 

I’m two years into my HTA-SD, no conversion. It’s all Texas weapon. Had them do some custom milling on my Fleming trigger housing (Billet aluminum)for my Franklin binary trigger and had to add KAC trigger housing guard. She is unique and quite the looker. ~1500 rounds, runs like sewing machine.. she’s a dirty girl but that’s therapy cleaning her.
I’m on Team HTA all the way !