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Screaming Koala
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4,685 Posts
Discussion Starter #1
The goal here was to test the Kingmann Derlin ACS Bolt for the Imagine.

Equipment used:

04 Imagine, with box stock parts except for following-
new switch
trigger mods
Derlin ACS Bolt
Stock barrel and SP Teardrop, both used.
Non-motorized hopper
Running on 7Oz. CO2.

Conditions:
Outdoor woods enviroment
Slight snowfall in air, heavy on ground
~21 degrees F, ~9 windchill
Wind at 11 mph to 18
Humidity 58%
(Weather channel update at 3pm. Test was at 2:45.

Velocity was ~200 and unable to go higher.

Paint was old (2+ months) Super Swirl and cheap generic paint, The kind that comes in that plastic box at Dicks Sporting Goods. Paint was room temperature warm until it got outside where it sat in a plastic bag on top of my car.

Test:

The history of this imagine is that it hasn't made it through a game without a chop. Building on this I decided running the full auto setting without a agitator hopper would be a good test of the new bolt.

Using the stock barrel there were several barrel breaks. These were not chops as far as I can tell. The bolt and chamber remained clean after one hopper load.

I will point out that several times the marker did not recock, or even attempt to as I could tell. Curious about this, I blocked the bolt with my pencil and fired. It seems that the sping is soft enough to prevent chops, but hard enough to absorb the force the hammer needs to open the valve and blow back. Once recocked by hand the marker continued to cycle normally.

I walked back to the car to reload paint and changed the barrel out for the teardrop. Some more barrel breaks happened soon after, although the chamber and bolt were still clean.

Noticed Problems:
The marker did not always recock when the bolt prevented a chop.
Extreme blowback. When low on paint the entire stack in the elbow would blow upwards into the hopper. This may be related to the lack of O-rings on the bolt.

Conclusion:

I feel ACS Bolt is an upgrade to consider. It does its job of preventing chops quite well, with a few minor drawbacks as I wrote above.
However, the price of a new bolt comes close to that of a used T-board, and for those of you who are inclined to install the board and cut the body for eyes and wires might consider going the eye route, and using a traditional style bolt.
 

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Screaming Koala
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4,685 Posts
Discussion Starter #9
Might be worth mentioning the bolts can be taken apart with simple tools and the spring could be cut or replaced with one of different tension. With a lighter spring the bolt might lag behind the hammer and not move forward fast enough to seal the breech, increasing the blowback issues.

The one in this test was bought in slightly used condition so the spring might have some wear in it already. It was soft enough that I could put my finger into the chamber and fire. The gun would not recock when doing this though.
 

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Banned
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553 Posts
mine always recocked. I could never take the bolt apart to replace the spring though because kingman loctited the screws which made it impossible for me because the bolt would melt if i tried to melt the loctite.
 

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Registered
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89 Posts
Well would it be alright to have a t-board with eyes and a ACS bolt. Im asking this cuse my gun (PILOT ACS) comes witht eh bolt in it.
 

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Registered
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9 Posts
Very nice review done right. I did a search on ACS Bolts to get an idea if it would be worth the upgrade ... your review alone helped me to decide THANKS
 

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Registered
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22 Posts
Just a warning: I used the ACS bolt on my '03 imagine, and I cannot stress enough the "extreme blowback" point that was made in the review.
I played a couple games with this bolt and I had no chops, but the blowback had so much force that the balls were forced back up and burst in the hopper. After that balls were pretty much all stuck together and didn't want to move. However, I think this is a very isolated occurence.
I have since bought a tight-fitting delrin bolt with o-rings along with a spring kit, and now have some suction in the feed neck when fired.
 

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Retired, proud dad
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702 Posts
I personally have a delrin ACS bolt on my TLX, and I never had A SINGLE CHOP EVER. A lot of players do not believe me, but that's true. Sure I'm only a REC player, but I shot almost 10000 balls, and never chopped a single one.

The ACS bolt is the only upgrade I put on my TL-X, and it works really great. I never had any recocking problems too.
 
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