Brocock Compatto "slingshot" hammer and power adjuster

Brocock Compatto "slingshot" hammer and power adjuster

Joined: November 16th, 2015, 1:57 pm

August 10th, 2017, 9:18 pm #1

Hey guys, long time follower, first time poster today. I have a question for anyone with knowledge about the Brocock Compatto line. I just bought a .177 cal version and the website stated that it has the slingshot system in it. I am not seeing the power curve that I think I should. I shot a string across the chrony last night using JSB 8.4 grain and it started at 906 fps and ended at 853 fps with 50 shots going almost linearly down. It was from a 220 bar fill on the high power setting. I filled it back up to 220 bar and turned it to "low" power. I shot 10 shots and it started at 820 fps and it went to 815 fps. I would think that there should be more than 80 fps difference between having high and low power.
I have read a few posts from when they first came out stating similar findings. A look on the Straight Shooters "our take" page and it shows that a .177 with 8.4 grain should be around 900 for 40 shots on high power and around 650 for low power. Do you suppose I got a model that sat around on the shelf from the first run that didn't have the slingshot in them? Also the power adjustment knob seems to be catching between medium and low power. Almost like a full positive click between high and medium, but then kinda a half movement without such a positive click. I don't know if any of that makes sense.
Any advice or links to information would be greatly appreciated. Thanks and have a great day!
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Joined: April 3rd, 2010, 2:43 am

August 11th, 2017, 1:27 am #2

My 22 shot string was decreasing like yours, at least until I started filling to 220 bar. That helped and got me closer to the spec of 30 shots. The Brocock website now says max fill is 240 bar, so try that if you can.

AoA should be able to confirm manufacturing date of your gun and if it has the improved slingshot system.
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Joined: February 20th, 2012, 2:47 pm

August 11th, 2017, 12:45 pm #3

Hey guys, long time follower, first time poster today. I have a question for anyone with knowledge about the Brocock Compatto line. I just bought a .177 cal version and the website stated that it has the slingshot system in it. I am not seeing the power curve that I think I should. I shot a string across the chrony last night using JSB 8.4 grain and it started at 906 fps and ended at 853 fps with 50 shots going almost linearly down. It was from a 220 bar fill on the high power setting. I filled it back up to 220 bar and turned it to "low" power. I shot 10 shots and it started at 820 fps and it went to 815 fps. I would think that there should be more than 80 fps difference between having high and low power.
I have read a few posts from when they first came out stating similar findings. A look on the Straight Shooters "our take" page and it shows that a .177 with 8.4 grain should be around 900 for 40 shots on high power and around 650 for low power. Do you suppose I got a model that sat around on the shelf from the first run that didn't have the slingshot in them? Also the power adjustment knob seems to be catching between medium and low power. Almost like a full positive click between high and medium, but then kinda a half movement without such a positive click. I don't know if any of that makes sense.
Any advice or links to information would be greatly appreciated. Thanks and have a great day!
what's the serial number on it ?
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Joined: November 16th, 2015, 1:57 pm

August 12th, 2017, 1:04 am #4

Thanks for responding both of you, it says N/L 1742 on the breech block but that is all I can see.
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Joined: February 20th, 2012, 2:47 pm

August 12th, 2017, 3:05 am #5

I will email brocock
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Joined: April 3rd, 2010, 2:43 am

August 14th, 2017, 11:08 am #6

Thanks for responding both of you, it says N/L 1742 on the breech block but that is all I can see.
My serial number is 1735 and this is what Brocock responded to me:

"I can however confirm rifle NL-1735 is fitted with slingshot manufactured November 2016."
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Joined: November 16th, 2015, 1:57 pm

August 14th, 2017, 1:17 pm #7

Thanks for that response. I pulled the stock off looked at the hammer assembly and it is the slingshot setup. I plan on running some more pellets over the chrony tonight to see just what the different power settings produce. I am thinking my power adjustment knob is not turning all the way down. Have a great day.
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Joined: April 3rd, 2010, 2:43 am

August 14th, 2017, 3:31 pm #8

I absolutely love my Compatto. It has been a great hunter, taking groundhogs out to 50 yards with ease and pesting birds even further. I always toy with the idea of getting another yet another PCP but I think the thing I likemost about this gun are the great ergonomics. It really, really carries great and shoulders quickly.





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