troy TRX Extreme battle rail ?
I see that the Midwest Industries SS rail has been modified to work with the AA kit. Has anyone figured out how to make the Troy TRX rail work I like the grooves of the Troy verse the smooth finish of the Midwest rail better
Neither the Midwest SS series or the Troy TRX Battlerails will work with our system. The barrel nut is too large and it binds the drive rod keeping it from cycling.
Originally Posted By AdamsArms:
Neither the Midwest SS series or the Troy TRX Battlerails will work with our system. The barrel nut is too large and it binds the drive rod keeping it from cycling.
Yes I know that the Midwest ss rail from the factory will not work as is but it has been adapted, and is a realitivly easy mod to perform. What I am looking for is this ? Is the Troy as easy to adapt to the AA kit as the Midwest and if so I am all over it like a cheap suite

We have never done the mods to the Midwest rail to know how similar it is to the Troy rail. I'd recommend contacting the guy on here that figured out the mod for the Midwest rail and seeing if he can provide you with some more information. Also contact Troy directly and see if they can help shed any light on the subject.
I have got a 11 inch trx rail on the way for my Spikes st22 Before I put it on my 22 I am gonna look to see if it would be easy to mod it to work with the AAkit . And if it will work ill order a nine inch rail and build a mid lenght .
Kurt (762x40mm) has an AA kit on a midlength with a 9" TRX-Extreme .
He has a thread in the AR Variants section "6.8 ARK and the new TTSX 95. . ."
Originally Posted By gdblair:
Kurt (762x40mm) has an AA kit on a midlength with a 9" TRX-Extreme .
He has a thread in the AR Variants section "6.8 ARK and the new TTSX 95. . ."
Wow sweet !thanks for letting me know about this.I have ask him if he could post the info here so we all can see this.
I installed a 11" TRX. on my Spikes st22 and im loving it

Originally Posted By kabob:
Originally Posted By 762x40mm:
Originally Posted By ttrmike:
So on the mid length TRX you didn't have to do any modifications to the rail itself to get the Adams Arms mid length gas piston to fit?
Mid length went together fine with no mods.....set it up with a 8.755 gas system, from extension shoulder to gas block shoulder and it ended up having about 3/32" between the end of the rail and the gas block....the rail tunnel fit the piston rod fine, it's close but does not touch.....as would be expected with the piston system, alignment of everything is critical....runs flawless and clean.....one of the things I like about it is no rose colored bullets, meaning the hot DI gas doesn't get the chance to pre-heat the up coming bullet in the mag....makes for more consistant loads, not as much temp change....
Can u post this up in the Adams Arms forum lots of people would love to see this about the TRX rail. I am stoked that i found this resource. Thanks for showing us that this can be done!

Sure.....
Adams Arms / TRX / 6.8 ARK info
The mid went together fine....system length and cycling.....
The carbine TRX is a little too long, but made it work also......

There is also a nice thread in the piston forum that compares DI vs piston temps which is very interesting in the receiver/bolt/bc area.
Originally Posted By 762x40mm:
Originally Posted By kabob:
Originally Posted By 762x40mm:
Originally Posted By ttrmike:
So on the mid length TRX you didn't have to do any modifications to the rail itself to get the Adams Arms mid length gas piston to fit?
Mid length went together fine with no mods.....set it up with a 8.755 gas system, from extension shoulder to gas block shoulder and it ended up having about 3/32" between the end of the rail and the gas block....the rail tunnel fit the piston rod fine, it's close but does not touch.....as would be expected with the piston system, alignment of everything is critical....runs flawless and clean.....one of the things I like about it is no rose colored bullets, meaning the hot DI gas doesn't get the chance to pre-heat the up coming bullet in the mag....makes for more consistant loads, not as much temp change....
Can u post this up in the Adams Arms forum lots of people would love to see this about the TRX rail. I am stoked that i found this resource. Thanks for showing us that this can be done!

Sure.....
Adams Arms / TRX / 6.8 ARK info
The mid went together fine....system length and cycling.....
The carbine TRX is a little too long, but made it work also......
http://media.ar15.com/media/viewFile.html?i=19158
Is the piston system different for your setup vs the 5.56? i.e. if you didn't have any issues with the the Troy Extreme than someone with a midlength 5.56 system won't either?
I just got off the phone with Troy.
The inner diameter of the tube is 1.35 inches
The diameter of the upper passage is 0.5 inches
Their centerline to top of the upper passage (inside) is 1.05 inches.
According to AA's FAQ it seems like this part will fit.
I'm not sure about the barrel nut portion though

Originally Posted By AdamsArms:
We have never done the mods to the Midwest rail to know how similar it is to the Troy rail. I'd recommend contacting the guy on here that figured out the mod for the Midwest rail and seeing if he can provide you with some more information. Also contact Troy directly and see if they can help shed any light on the subject.
Now that the centerfire upper is complete, it can be seen with the dedicated rimfire.
Top unit:
DPMS Lo-Pro upper receiver
Anschutz 18" .22LR 1:16" twist match target blank custom machined by WGR in Princeton, TX
Model 1 Sales dedicated bolt
MI SS-12 handguard
PNW high powered rear sight with Gehmann adjustable rear iris
Sinclair 22mm AR-15 height front sight with Gehmann adjustable front iris
Bottom unit:
Spikes Tactical receiver
Lothar Walther 20" .223 Wylde 1:8" twist medium contour stainless barrel with matching chrome bolt
Adams Arms Gas Piston kit, rifle length
POF-USA roller cam pin
MI SS-12 handguard
MI ERS rear sight
MI folding front sight
Lower receiver:
Spikes Tactical Cole series receiver
Magpul PRS stock
DPMS Panther grip
Geissle DMR trigger
Yes, the SS series handguards will work with the Adams Arms kit, if you are willing to do more than just try to bolt it together. The design of the barrel nut is much thicker than the standard unit, which the drive rod requires. First take the barrel nut and torque it to find the correct hole alignment. Mark this location, then remove the nut. Using either a drill press or vertical mill and a 0.375" center cutting endmill, create the necessary pocket for the spring cup and return spring.
Because I am using a rifle length kit, I wanted to make sure I had perfect alignment between the drive rod and the barrel. This will help eliminate any unnecessary binding.
Once I was satisfied with the barrel nut placement, it was time to install the handguard, torque it to the pocketed hole and check the alignment.
I had to trim the length of the drive rod. If the gas block was against the barrel shoulder, the bolt would be pushed slightly out of battery. I did my measurements, then cut 0.050" off the end contacting the bolt carrier. This provided the correct amount of clearance needed for the drive rod at the gas block.
Hope this helps show how this handguard can be used with the AA kit.
I just got the Troy TRX Extreme in the mail today.
My barrel is currently out for modification so I couldn't really test it out.
*EDIT*
It does seem to install without any interference. Originally I attempted to mock it up without the barrel and realized the barrel pushed the barrel nut into a slightly different position within the handguard.
Once I spaced out the barrel nut a bit, it seems that the handguard will work fine.
I will have to wait and see what happens when I receive my barrel back. It "should" work without issues.
Currently my issue with this thing is that one of my screws that tighten the rail to the barrel nut is slightly stripped. I unscrewed it per instructions and it was already stripped!
I noticed there are helicoils and I wondered if I got something used...then did some research to find that the TRX actually comes with helicoils. Weird.
Ok. I can confirm that it does fit.
I have not test fired it because I'm not completely done with the build yet. I still need to cerakote the rail, get my T-1, and get my Battle Comp 1.0
But at least I know it fits.

is that a 9" rail?
STATUS???
did your upper work??? Does it work reliably ????
Im in same situation got my gun all build with 7" midwest for carbine - then was like "oh crap - ive now got a single shot AR"
need to take it all apart and modify the nut i guess....
Mine runs just fine. 16" M4 barrrel. No problems.
I guess I'll update this for those still wondering.
Yes the TRX Extreme works fine. No issues.
I also helped a friend with his new upper and put on a VTAC TRX Extreme (same as the Troy but with horizontal slits instead of round holes) and it also went on without any issues.
I am trying to get mine going with the TRX extreme. it seems the barrel nut may be too long. with the push rod spring cup resting against the barrel nut, the drive rod is about 1/8 short of contacting the bcg. maybe a little more than 1/8 inch
Originally Posted By diverman:
I am trying to get mine going with the TRX extreme. it seems the barrel nut may be too long. with the push rod spring cup resting against the barrel nut, the drive rod is about 1/8 short of contacting the bcg. maybe a little more than 1/8 inch
I have built 2 of these but I used a complete Adams Arms upper to do it...not a conversion kit.
I didn't have issues on either one.
Stupid question but why does it need to actually make contact with the BCG? It's going to when the gas operates the piston anyway.
Originally Posted By Underwhere:
Originally Posted By diverman:
I am trying to get mine going with the TRX extreme. it seems the barrel nut may be too long. with the push rod spring cup resting against the barrel nut, the drive rod is about 1/8 short of contacting the bcg. maybe a little more than 1/8 inch
I have built 2 of these but I used a complete Adams Arms upper to do it...not a conversion kit.
I didn't have issues on either one.
Stupid question but
why does it need to actually make contact with the BCG? It's going to when the gas operates the piston anyway.
My guess would be that without contacting the BCG you wouldnt have the full length of the stroke. I asked the question elsewhere and the answer was that the rod needs to be touching the BCG.
Originally Posted By diverman:
Originally Posted By Underwhere:
Originally Posted By diverman:
I am trying to get mine going with the TRX extreme. it seems the barrel nut may be too long. with the push rod spring cup resting against the barrel nut, the drive rod is about 1/8 short of contacting the bcg. maybe a little more than 1/8 inch
I have built 2 of these but I used a complete Adams Arms upper to do it...not a conversion kit.
I didn't have issues on either one.
Stupid question but
why does it need to actually make contact with the BCG? It's going to when the gas operates the piston anyway.
My guess would be that without contacting the BCG you wouldnt have the full length of the stroke. I asked the question elsewhere and the answer was that the rod needs to be touching the BCG.
Interesting. Both of the ones I've done work perfectly fine.
Are you installing a kit or a doing this on a complete AA upper?
Originally Posted By Underwhere:
Originally Posted By diverman:
Originally Posted By Underwhere:
Originally Posted By diverman:
I am trying to get mine going with the TRX extreme. it seems the barrel nut may be too long. with the push rod spring cup resting against the barrel nut, the drive rod is about 1/8 short of contacting the bcg. maybe a little more than 1/8 inch
I have built 2 of these but I used a complete Adams Arms upper to do it...not a conversion kit.
I didn't have issues on either one.
Stupid question but
why does it need to actually make contact with the BCG? It's going to when the gas operates the piston anyway.
My guess would be that without contacting the BCG you wouldnt have the full length of the stroke. I asked the question elsewhere and the answer was that the rod needs to be touching the BCG.
Interesting. Both of the ones I've done work perfectly fine.
Are you installing a kit or a doing this on a complete AA upper?
Kit
Originally Posted By diverman:
Originally Posted By Underwhere:
Originally Posted By diverman:
Originally Posted By Underwhere:
Originally Posted By diverman:
I am trying to get mine going with the TRX extreme. it seems the barrel nut may be too long. with the push rod spring cup resting against the barrel nut, the drive rod is about 1/8 short of contacting the bcg. maybe a little more than 1/8 inch
I have built 2 of these but I used a complete Adams Arms upper to do it...not a conversion kit.
I didn't have issues on either one.
Stupid question but
why does it need to actually make contact with the BCG? It's going to when the gas operates the piston anyway.
My guess would be that without contacting the BCG you wouldnt have the full length of the stroke. I asked the question elsewhere and the answer was that the rod needs to be touching the BCG.
Interesting. Both of the ones I've done work perfectly fine.
Are you installing a kit or a doing this on a complete AA upper?
Kit
Maybe that is the difference. I'm not sure why it would be though.
Soooo if I order a TRX Extreme 9 Inch, it will just fit my midlength AA factory upper no problem? Or should I do the 7 inch?
Originally Posted By TacticalTaco:
Soooo if I order a TRX Extreme 9 Inch, it will just fit my midlength AA factory upper no problem? Or should I do the 7 inch?
Look (click on it) at the hot link that 762x40MM put up in his above post and look how his system fits together using a midlenght system. His pics above show that the carbine length has to be modded for it to fit, but it looks real easy to do that one.
Originally Posted By TacticalTaco:
Soooo if I order a TRX Extreme 9 Inch, it will just fit my midlength AA factory upper no problem? Or should I do the 7 inch?
I've done 5 midlength builds with Troy rails - All of them 9 inch and none of them had any issues.
http://www.ar15.com/forums/t_2_293/207511_I_think_I_overdid_it.html