Magpul PTS ACR/Masada MEGATHREAD

[Bloodshot]

hmmmm i think i will wait till the gen 2 comes out and see what it is like from there

[Sleepy]

Originally my friend used a Firefox 1100mAh 15C lipo but when I was installing a new piston my teammate found out that 2 Hot power 11.1v 1600mAh 12C lipo stick batteries can fit in parallel in the hand guard making a combined mAh of 3200mAH!

I'm pretty sure this isn't how it works. Wiring two packs in parallel would give you a combined voltage of 22.2v, but still only 1600mAh. Now, do you mean that it simply holds 2 packs, and you swap between them?

[Bush Killer]

Originally my friend used a Firefox 1100mAh 15C lipo but when I was installing a new piston my teammate found out that 2 Hot power 11.1v 1600mAh 12C lipo stick batteries can fit in parallel in the hand guard making a combined mAh of 3200mAH!

I'm pretty sure this isn't how it works. Wiring two packs in parallel would give you a combined voltage of 22.2v, but still only 1600mAh. Now, do you mean that it simply holds 2 packs, and you swap between them?

Nice thought, but nope.

It's all about rewiring the battery packs in parallel, rather than in a series.

http://en.wikipedia.org/wiki/Series_and ... l_circuits

[Nec]

Originally my friend used a Firefox 1100mAh 15C lipo but when I was installing a new piston my teammate found out that 2 Hot power 11.1v 1600mAh 12C lipo stick batteries can fit in parallel in the hand guard making a combined mAh of 3200mAH!

I'm pretty sure this isn't how it works. Wiring two packs in parallel would give you a combined voltage of 22.2v, but still only 1600mAh. Now, do you mean that it simply holds 2 packs, and you swap between them?

According to Kirchhoff's Voltage Law: The voltage across each parallel branch in a circuit is the same.
http://www.allaboutcircuits.com/vol_1/chpt_6/2.html

[Tombstone]

Originally my friend used a Firefox 1100mAh 15C lipo but when I was installing a new piston my teammate found out that 2 Hot power 11.1v 1600mAh 12C lipo stick batteries can fit in parallel in the hand guard making a combined mAh of 3200mAH!

I'm pretty sure this isn't how it works. Wiring two packs in parallel would give you a combined voltage of 22.2v, but still only 1600mAh. Now, do you mean that it simply holds 2 packs, and you swap between them?

According to Kirchhoff's Voltage Law: The voltage across each parallel branch in a circuit is the same.
http://www.allaboutcircuits.com/vol_1/chpt_6/2.html

[Rogue Reaper]

Series doubles voltage.

Parallel doubles capacity

When series or parallel you should always charge and discharge the batteries as a pack not individually so they equalize otherwise one pack will have lower ampacity and draw the other one down to it.

[Nec]

Series doubles voltage.

Parallel doubles capacity

I think he got the picture.

[PanzerFaust]

necro'ed to add:

I've had my ACR for a few days now, received it friday. I've already fixed a couple of issues the gun had practically out of the box. Serial is MPTS01896

Feeding from midcaps was sporadic on full auto, even with a relatively low ROF. So I fabricated and installed a sector clip to fix that. While I had the geabox open I noticed the pistonhead was loose, and the angle of engagement was a little short. I was able to remedy the angle of engagement using a small 1mm thick metal washer to shim the pistonhead, which was firmly tightened down. The gun's shooting beautifully now!

Otherwise the gearbox looked to be in good order, didn't even have to mess with the shimming too much (I did anyway ). I wish the motor packed a little more oomph. Will probably be replacing that with a G&P M120 short in the near future.

These were minor issues really, but ones that still could have easily put it out of action at an upcoming game with a blown piston or feeding problems, ruining my day.

With all that said I am in bleeding love with this gun.

[Nec]

PanzerFaust, what was the stock FPS?
Just last night I modified a Dream Army Masada double O-ring air nozzle to fit my friends ACR. For the first time his ACR, is shotting 394 +-5 FPS with .2g.
Of course If we plan to make this into a MGAPUL ACR mega thread, I'll be throwing in a tutorial as to how to modify a Masada air-nozzle to fit in a Magpull ACR.

[Riddick]

stock fps is around 345. at least on mine it was

[PanzerFaust]

I'd like to see that tutorial, Nec.

Mine's shooting in between 340-350. A decent 15 RPS with a 7.4v 1200mah li-poly too.

[Aeacus]

PanzerFaust, what was the stock FPS?
Just last night I modified a Dream Army Masada double O-ring air nozzle to fit my friends ACR. For the first time his ACR, is shotting 394 +-5 FPS with .2g.
Of course If we plan to make this into a MGAPUL ACR mega thread, I'll be throwing in a tutorial as to how to modify a Masada air-nozzle to fit in a Magpull ACR.

You must give details man!

[PanzerFaust]

After chrono'ing I decided to check the hopup and noticed my shots veering to the right. A quick google search yielded the following article:

http://www.acmeairsoft.com/showthread.php?t=10178

where the author fixed his issue by filing down a portion of the inner barrel clip and reseating the inner barrel so it was no longer canted, which it had been, slightly. Fixed my issue the same way, and tossed in a G&G silicone bucking for good measure. MUCH BETTER NOW.

The biggest issue that I have with the gun is that the shots on the model I'm reviewing tended to swerve to the right. Taking the lower receiver off, looking through the upper receiver, and into the hop chamber reveals that the inner barrel and hop bucking is canted over to thr right by a little bit which then causes for the shots to swerve to the right.

Taking the outer barrel off, filing part of the inner barrel clip, and turning the outer barrel/hop bucking to the left corrected the shooting issue.

Let us birth the megathread!

[Nec]

Give me a few days and I'll wrap up the tutorial. Studying for final is first.

and tossed in a G&G silicone bucking for good measure. MUCH BETTER NOW.

Hold the phone! G&G makes a silicone bucking?!

[Riddick]

Give me a few days and I'll wrap up the tutorial. Studying for final is first.

and tossed in a G&G silicone bucking for good measure. MUCH BETTER NOW.

Hold the phone! G&G makes a silicone bucking?!

they have for quite awhile