AR15, Piston vs Direct Impingement: An observation.

[tonyxcom]

I bet the class armorer had an extra gas block for it, just in case, too.

[geoint]

I suspect home built guns, froglube, or weak ammo could be some of the causes. I previously owned one of the original pws piston ar's and while nice, really did nothing special over the di version. Instead of cleaning the bcg u had to clean the piston.

I just got to run my MK114 upper for the first time and ya cleaning the piston was a PITA. I know you dont really have to clean it but seeing it dirty just bugged me. I cant believe Im saying this but I think Id rather clean a BCG than have to clean that piston again.

[tonyxcom]

I was looking at a family members HK416 the other day and the BCG was like a piece of jewelry. The bolt was spring loaded in the carrier and was smooth as butter. Was accurate as heck too. Was shooting it at 650y with a T1, using the foliage as hold over reference and getting repeated hits.

[spyde12]

I just got to run my MK114 upper for the first time and ya cleaning the piston was a PITA. I know you dont really have to clean it but seeing it dirty just bugged me. I cant believe Im saying this but I think Id rather clean a BCG than have to clean that piston again.

Serious question and not rhetorical.

How much different is the piston on the MK114 compared to an Adams Arms? Grant it, I haven't gone through a torture test with it. However, both the BCG and the piston assembly for my AA is barely dirty.

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[bigdawg86]

Serious question and not rhetorical.

How much different is the piston on the MK114 compared to an Adams Arms? Grant it, I haven't gone through a torture test with it. However, both the BCG and the piston assembly for my AA is barely dirty.

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I second this... 500 rounds from the class barely dusted the piston assembly with residue. I have Adam's Arms

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[Nguyen]

Serious question and not rhetorical.

How much different is the piston on the MK114 compared to an Adams Arms? Grant it, I haven't gone through a torture test with it. However, both the BCG and the piston assembly for my AA is barely dirty.

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i have both mk116 and adams arms...

You just need to wipe down the piston. Adams arms is a bit easier since you dont need to take out the BCG to wipe down the piston rod.

[Nguyen]

I just got to run my MK114 upper for the first time and ya cleaning the piston was a PITA. I know you dont really have to clean it but seeing it dirty just bugged me. I cant believe Im saying this but I think Id rather clean a BCG than have to clean that piston again.

It doesn't need to be squeaky clean...

[Ronin2]

QUOTE-
The range masters changed a few gas blocks and rebuilt a few BCG's


OP-
What class?
I have attended a decent amount of courses.....across a number of schools....


I have seen all sorts of firearms break.... but never an instructor rebuild a BCG....


What school? Website?

I was thinking the same thing... Thirty students...?? How many instructors?

[meno377]

So I took a 2 day carbine course this weekend. It was an absolute blast, but the weather was insane. Freezing cold, non stop heavy rain, occasional hurricane force winds.

There were about 30 people in the class. Weapons systems range from high end to low end. Most people were average joes. There were a few guys in full kit, with the most insane **** hanging off the front of their rifles.

The first day weather wasn't horrible, saw a few people problems with some rifles but overall nothing major.

Day two the weather was insane. Freezing cold, non stop heavy rain, occasional hurricane force winds. Every rifle was sopping wet and filty. There were about 6-8 guns that couldn't run more than a few rounds without an jam, FTF, FTE, etc. The range masters changed a few gas blocks and rebuilt a few BCG's. They still had problems and had to oil these guns every few rounds it seems. These were all DI guns. Most notably, they were the guns of the mall ninja's... in hind site all there gear was probably airsoft haha.

It was just an odd occurrence to me, and a real eye opener for the others that couldn't get their guns to work. So why only problems with the DI guns?

All my friends including myself had piston guns and they ran perfectly.

Considering the military has used DI versions for over 40 years with success, and you consider it an eye opener attending a two day course?

[spyde12]

i have both mk116 and adams arms...

You just need to wipe down the piston. Adams arms is a bit easier since you dont need to take out the BCG to wipe down the piston rod.

Yea, it's pretty easy to assemble and disassemble. Outside of some minor dust particles, the BCG and piston assembly stays really clean. Not bad for a $650 complete pistol upper.

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[mif_slim]

Enough information here for me never to buy a piston setup

http://www.thefirearmblog.com/blog/2...-rental-range/

LoL, article says that PSA worked as good as DD and others.... NO WAY!!!

[bigdawg86]

Considering the military has used DI versions for over 40 years with success, and you consider it an eye opener attending a two day course?

The military is wrong and the piston gods are right.

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[ZombieKiller]

Rebuilt gas blocks on the range?

C'mon.... Lol.


Sent from my fire using smoke signals

[nate76239]

Rebuilt gas blocks on the range?

C'mon.... Lol.

Sounds like some Frankenbuild ARs with budget parts if it happened, I wonder what they charged for the replacement gas blocks

[saki302]

Enough information here for me never to buy a piston setup

.. unless it's made by H&K