Author Topic: My 1st 1377 Carbine Project (Read 16929 times))

FuzzyGrub · « **on:** November 01, 2012, 08:11:45 PM »

This is my 1st project, and most of the info was found here and on a few other sites. Thanks for the input.

It has the Discovery .177 barrel, sights and related parts.
Crosman Steel Breach
Crosman Bugout stock and fore arm.
ATI SKS Cheek Riser
Crosman 3-9X32 scope (from my vantage)

A couple comments about the Discovery barrel: this has machined flat spots in the barrel for the sights. It also has a dimple mid-barrel, which I suspect is a tooling mark for holding during the machining, or where a barrel band screw contacts it. The barrel sleave from the Discovery will cover the rear machine mark. You would not need to add the sight. The front fake muzzle brake, covers the front machining. In both cases, a set screw tightens against these flats. The discovery fake brake, also has a half-moon cut-out under neigth, to allow for the air resivor tube. Just FYI it is not fully round.

Trigger work includes polishing contact areas, brass shim washers, moly, plus reduced tension sear spring and homemade guide.

Currently running 620ft/sec at muzzle @ 10 pumps (100 increase from barrel)

Below, you will find a 10 shot group at 10yds, bench rest, indoor range. A couple of flyers!

Left to do: (when MellonAir parts arrive)

- Debur and Lube
- Install flat-top piston and valve
- Install pivot bolt
- Locktite and reassemble
- Wax fill bolt screw
- Shim the barrel band within the pump tube (there is some play)

Dockey 454 · « **Reply #1 on:** November 01, 2012, 08:35:45 PM »

Looks great, nice job, now go and enjoy it.

joe k · « **Reply #2 on:** November 01, 2012, 08:37:46 PM »

nice looking carbine.
joe

breakfastchef · « **Reply #3 on:** November 01, 2012, 09:59:17 PM »

You did all the right things. It turned out great. Once you get the flat top piston and valve installed, it will be a powerful little pesting gun.

Tater · « **Reply #4 on:** November 02, 2012, 10:53:16 AM »

Nice job, it looks and seems to shoot great.

gene_sc · « **Reply #5 on:** November 02, 2012, 11:39:19 AM »

I just got my new Bug Out Kit last week. I want to mod it this winter.
Yours looks great.
Gene

1377x · « **Reply #6 on:** November 02, 2012, 03:24:19 PM »

nice job!
congrats!

1nmartin · « **Reply #7 on:** November 02, 2012, 03:31:00 PM »

Looks like it shoots pretty good! Nice work.
A 13xx or 22xx carbine is somewhere on my wishlist

westgl · « **Reply #8 on:** November 13, 2012, 12:51:55 PM »

Looks great,

What fore grip is that, Is that the stock bug out foregrip?

I like that much better than the stock 1322 skinny fore grip.

I wonder if i can buy that fore grip separate?

Anyone have a part number on that fore grip?

Or maybe a parts exploded view parts list for that gun?

JMJ in NC · « **Reply #9 on:** November 13, 2012, 02:17:21 PM »

Looks nice (and oddly familiar?).

JMJ

dwk54rak · « **Reply #10 on:** November 13, 2012, 03:18:43 PM »

I bought a couple of the fore grips. They are from the 1389 that crosman stopped production on. You can look the part no. up by looking at the schematic for the 1389. About $10 when I was buying them a few months ago. It is also standard on the Bug out kit. Don't know the model of that one.
Darrell

YSYEO · « **Reply #11 on:** November 13, 2012, 06:02:47 PM »

The current Bug-out forearm grip (black) is part # 1389-025 and costs $8.75 plus shipping ($4 per order) from Crosman.

FuzzyGrub · « **Reply #12 on:** November 13, 2012, 06:56:30 PM »

Quote from: YSYEO on November 13, 2012, 06:02:47 PM

The current Bug-out forearm grip (black) is part # 1389-025 and costs $8.75 plus shipping ($4 per order) from Crosman.

Yep, that is the part number and what I paid.

FuzzyGrub · « **Reply #13 on:** December 27, 2012, 04:52:02 PM »

The Mellonair piston, valve, and pivot bolt, came a few weeks ago. Installed all and adjusted piston, installed lighter valve spring, and discovery hammer spring. I couldn't get the chrony to work with any improvised lighting in the basement.

I will have to wait until a sunny day to get some readings. It definitly feels like it has higher velocity at 10 pumps. Also at 15 pumps, getting complete dumping of air.

trigger · « **Reply #14 on:** December 27, 2012, 10:47:52 PM »

i have a backpacker that I will use for sqirrel,rabbit,etc. What improvement will increase power and accuracy best per-$? Also, does a scope really help over the stock sights for hunting? I am wanting to become a much better shot, so what is a good sight? Thanks.

FuzzyGrub · « **Reply #15 on:** December 28, 2012, 10:19:39 AM »

Quote from: trigger on December 27, 2012, 10:47:52 PM

i have a backpacker that I will use for sqirrel,rabbit,etc. What improvement will increase power and accuracy best per-$? Also, does a scope really help over the stock sights for hunting? I am wanting to become a much better shot, so what is a good sight? Thanks.

IMHO: this platform is not the best for a pure hunting rifle. While the longer barrel, flat-top piston & valve get the velocity up, it is still marginal for hunting. Iron sights are good for close range and a constantly moving target, but with marginal fpe, a scope is probably needed to make accurate head shots. With 12-15 pumps, a follow-up shot will take some time.

For myself, I'd use my Marauder or break barrel, before this rifle for dispatching varmits. This will be enough to kick the sand up and chase away the poop factories (canadian geese). Maybe a stupid red or striped rat.

FuzzyGrub · « **Reply #16 on:** December 28, 2012, 02:30:54 PM »

A couple of things I want to mention:

- I found that the barrel band was pulling down on the barrel. This was causing most of my droop issue I reported earlier on. I sanded the inside of the band until sliding it in place didn't cause the barrel to pull in to the tube. The poi @ 10 yds went up an inch.

- I touched up the barrel crown, but did not appear to make any change. In the process, found that having the small barrel shroud on did. This turned out to be a set-screw issue. Ie tightening it down caused the issue. This is a Discovery barrel with Discovery shroud. Something Discovery owners might want to check.

LAalex · « **Reply #17 on:** December 28, 2012, 08:23:36 PM »

Nice little rifle FG. BTW, how's the Vantage shooting?

Scotty

FuzzyGrub · « **Reply #18 on:** December 29, 2012, 09:27:57 AM »

Quote from: cajunboy on December 28, 2012, 08:23:36 PM

Nice little rifle FG. BTW, how's the Vantage shooting?

Scotty

Still doing well. Shot it a few days ago. It is a little more accurate than the 1377 carbine @ 10yds. The seals did come in, so need to do the lube/tune on it.

LAalex · « **Reply #19 on:** December 29, 2012, 07:48:44 PM »

Looking forward to hearing about it.

Scotty

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My 1st 1377 Carbine Project

Author Topic: My 1st 1377 Carbine Project (Read 16929 times))