1300 Medalist Mods … Pumped Up
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All Springer/NP/PCP Air Gun Discussion General
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Vintage Air Gun Gate
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1300 Medalist Mods … Pumped Up
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Topic: 1300 Medalist Mods … Pumped Up (Read 471 times))
threesuns
Sharp Shooter
Posts: 641
yes
Real Name: Timothy
1300 Medalist Mods … Pumped Up
«
on:
September 17, 2022, 02:17:42 PM »
In the spring I picked up a couple crosman parts pistols (a phase 2 1377 & 1300 medalist II) & set about making 1 from 2.
Here’s a link …
https://www.gatewaytoairguns.org/GTA/index.php?topic=199022.0
… to my initial modified 1300.
Seeing room for improvement I made a few more modifications & am really pumped up with the results.
1rst … though using the 1377 rear cocker, the trigger could be improved further with a little attention to the contact points & reducing the spring by about 1 coil. It is still a little long but, butter smooth!
2nd … better front sight by Blue Fork & fits the modern 13xx pistols, which meant shorting the tube by 7/32” to align the pivot pin holes & relieving the pump handle just a little to vent the compression chamber at full extension.
3rd … replaced my modified 1377 pump rod & cup with the correct 1300 medalist pump rod & cup + flat topped the 1377 valve to match. I’m using the old style 1377 check valve which reduces volume by a little & angled the exhaust for better flow. Lastly changed out the OEM TP for poly tubing.
Results
nearly 10% gain in fps (10 pumps was 340 with 14.3 CPHP from walmart & now 370fps).
curiosity got the best of me … (only did 1x but 15 pumps = 414fps with no residual air)
… the longer phase 2 1377 barrel hit 490fps with 7.9gr & 10 pumps
… installing my phase 1 1322 upper saw close to 15fps gain over the shorter barrel
i really like this pistol but NOT the original blow off valve!
When thinking about this I couldn’t find a lot of mod recommendations for the 1300 Medalist & hope this is of interest to others.
Logged
USA, NY, Buffalo
Mzq284
Plinker
Posts: 126
yes
Real Name: Peter
Re: 1300 Medalist Mods … Pumped Up
«
Reply #1 on:
September 18, 2022, 10:15:24 PM »
Very kool pistol. I had one i picked up in a deal, it pumped up fine and shot good but the trigger was atrocious. A friend asked about it a few times so i gave it to him. He's enjoying it.
Logged
USA, MI, Avoca
Ascot500
Plinker
Posts: 143
yes
Real Name: Nikola
Re: 1300 Medalist Mods … Pumped Up
«
Reply #2 on:
September 19, 2022, 09:09:58 AM »
Why do you dislike the blow off valve?
Logged
Pinehurst, NC, USA
Artemis CP400
Lovena 21
Daisy 25
Daisy 118
Crosman 111
Crosman M&P40
Crosman A4P
Gamo PR-45
Hammerli Single
Steyr LP10
Umarex M1A1
Umarex Notos
QB78
The life of every man is a diary in which he means to write one story, and writes another; and his humblest hour is when he compares the volume as it is with what he vowed to make it.
J.M. Barrie
threesuns
Sharp Shooter
Posts: 641
yes
Real Name: Timothy
Re: 1300 Medalist Mods … Pumped Up
«
Reply #3 on:
September 19, 2022, 12:18:58 PM »
Given the option of resealing the original valve & it’s quad seal versus resealing a 1377 valve I opt’d for the latter. I find it much easier.
Also with the original design, the trigger gets increasingly harder to pull with each pump you put in. And as Mzq284 said, “the trigger was atrocious” (I’ll add at 8-10 pumps).
By adding the 1377 valve + rear cocking mechanism, trigger pull is consistent, because it determined by the hammer spring tension, whether I pump 6, 8, 10 or even 15 times.
Try 15 pumps with the original blow off valve & it would be nearly impossible to pull the trigger, if it wasn’t valve locked. Not that I’m advocating 15 pumps is always necessary but there may be times when 3fpe just won’t cut it & 6fpe is more than enough.
These mods have made this pistol a pleasure to shoot irregardless of the power output.
Logged
USA, NY, Buffalo
Ascot500
Plinker
Posts: 143
yes
Real Name: Nikola
Re: 1300 Medalist Mods … Pumped Up
«
Reply #4 on:
October 19, 2022, 02:41:40 PM »
Interesting
Thanks for the reply
Logged
Pinehurst, NC, USA
Artemis CP400
Lovena 21
Daisy 25
Daisy 118
Crosman 111
Crosman M&P40
Crosman A4P
Gamo PR-45
Hammerli Single
Steyr LP10
Umarex M1A1
Umarex Notos
QB78
The life of every man is a diary in which he means to write one story, and writes another; and his humblest hour is when he compares the volume as it is with what he vowed to make it.
J.M. Barrie
threesuns
Sharp Shooter
Posts: 641
yes
Real Name: Timothy
Re: 1300 Medalist Mods … Pumped Up
«
Reply #5 on:
December 13, 2022, 09:14:04 AM »
Mods to my 1300 Medalist continue. It now has a .177 conversion.
SSP .177 barrel shortened to 9 inches (10 was too long to my eye)
Barrel was married to an old style steel breech & port modded for a polly seal.
Magnet was removed from the probe & hollowed like the .22 probe.
Metal rear site was replaced with a plastic site modded (lowered) to get it to on at 30’ in my basement.
Performance wise FPE is dead nuts with the .22 barrel
10.5 CPs - 8 pumps 411fps & 10 pumps 430fps
8.64 HNs - 8 pumps 447fps & 10 pumps 470fps
Logged
USA, NY, Buffalo
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1300 Medalist Mods … Pumped Up