Im getting ready to build a 7.5 inch  pistol . did some research but but find conflicting info and wanted to see what you guys have to say..

i have a few friends say that it will be a major pain in the ass to get it to cycle properly (have YH low profile pistol gas block and tube) with the barrel being so short .... is there truth to this ? and if so what can you do to fix it..?

one of my friends told me just to do a adams arms piston kit on it and would run much better ....  but would a low profile piston fit my 9 inch  spikes bar rail? i really like this rail and dont want to get another.

and lastly , what buffer tube and spring  do most use ? i was thinking of doing either a phase 5 tube or pws , with spikes st2 buffer spring..

thanks , obviously have more home work to do.

The red will work but I don't know about the green stuff.
How many pistols has your friend built to know so much ??

I just put my 1st one together and it cycles like a champ so far. I'm running
7.5" barrel
Full auto BCG
PWS buffer tube with a regular ole carbine buffer spring with a H2 buffer
Noveske pistol length gas tube and low pro gas block

Same here. My 7.5" pistol runs fine
ASA chrome lined BBL with flaming pig
Ace pistol buffer tube
Spikes T2 buffer
PSA FA BCG with an o ring in it.
No problemo.

Good luck with your pistola OP
ETA: my pistol ejects brass into a neat little pile right at my 4 o clock.

thanks , he hasnt built any pistols but builds long ar's an bolt guns , he is a long range precision freak so you can understand the flack i catch for not having 20 inch barrel .

thanks guys, does a full auto BCG help any ?

and also would an adjustable gas block be a good idea just incase  the gas has to be adjusted , it would help instead of opening up the gas ports?

Opening the gas port is going to increase gas as I understand it and if you need more gas an adjustable gas block is not going to do anything if there is not enough gas coming through the gas port. Mine was the opposite, it was a cheap 7.5" barrel and came with a slightly too big gas port from the factory and had to get an adjustable gas block to tune it down cause of the enlarged gas port in the barrel. It worked fine with a standard low pro gas block but recoil was more violent than I liked and the brass was being thrown almost straight forwards... plus it was dinging the brass up pretty bad.

The port was so large I had the adjustment screw all the way in on my seekins block and it works perfect. No more dinged brass and they land to the 3 to 4 o clock area.

If its over gassed then M16 BCG, Heavy buffer, stiffer buffer spring will help the dwell time and slow everything down a bit but if its over gassed its just helping not fixing. Really the only way I see it to fix being over gassed is an adjustable gas block as its limiting the gas getting to the parts in the back and excess goes out the end of the barrel.

If it functions then the only downside to being over gassed is a increase in the wear of parts, more recoil, and sometimes it bangs your brass up a little more which is a problem if you reload like I do.

I have a M16BCG with standard buffer and spring with a seekins adjustable gas block on a Midwayusa 7.5" barrel. I had a YHM low pro non adjustable gas block on before and it just wasn't what I liked so I switched to the Seekins.

Hope that helps.

cool thanks, i have the YHM low pro gas block also. i guess im going to have to see after its done ... i have a feeling im gonna have to play around with different buffers springs gas blocks etc... till i find the right combo