Range report: Hodge barrel with LMT Enhanced BCG *UPDATE page 7*

[ABNAK]

I did not end up playing with different buffer weights. Used a stock carbine spring with an H2 buffer. Hodge 14.5" mid-length gas with a purported 0.74"-0.75" port size (made a little tighter for use with M855A1). Brand new LMT Enhanced BCG. I was wondering if, given the "tighter" Hodge gas port, and using an LMT EBCG, there would be function/cycling issues.

Fired 40 rounds of M855A1, 20 rounds of Mk318, and 20 rounds of IMI Razor 77gr 5.56.

My concerns were first and foremost function, i.e would it cycle properly, and secondarily lock-back on an empty mag. I fired essentially 3 rounds at a time so had 13 chances for lock-back on the M855A1, and 6 chances each with the Mk318 and IMI Razor.

M855A1: failed to lock-back twice out of 13 chances.

Mk318: failed to lock-back 3 out of 6 times. [Evidently the "weakest" of the three rounds, yet it shot higher.....see below]

IMI 77gr Razor: locked back 6 out of 6 times. [Statistically "stronger" recoil impulse than the M855A1, also surprising]

There ZERO failures to cycle of any kind (FTF, FTE, etc.). All 80 rounds shot and cycled fine.

I zeroed irons and EOTech with the M855A1 using a 50yd IBSZ (POA/POI at 50yds). The Mk318 shot a c-hair high at 50 (surprising), while the IMI 77gr Razor was an exact match for the M855A1 zero at that range.




This was a pretty warm day but I was in the shade with a slight breeze blowing. Would it function as well in a much colder environment? I have my doubts, but next winter I'll give it a whirl and if I do run into issues I'll try dropping buffer weight at that time.

[1168]

Interesting experiment. Would you mind running it again with a regular BCG?

That IMI stuff must be hot as $h1+.

[Pappabear]

So, are you satisfied and if not, what is your next step? I like 1168's suggestion.

PB

[jackblack73]

I thought "weaker" rounds were supposed to shoot higher. Based on what I've read, because it takes fractionally longer for the round to leave the muzzle, the barrel will be pointed fractionally higher due to muzzle rise.

[pointblank4445]

I've got 3 of these barrels

2x will feed everything and lock back when using a standard BCG, A5H2 buffer and Springco Green using - 77gr BH reman 223, 77gr BH red box 5.56, 62gr TSX BH, MEN 56gr, Win 62gr OTM

Just finished the last one and went standard Carbine buffer system for a change. H with Blue Springco and it wouldn't cycle the Win OTM on its intial outting. Looks like that will receive the A5 treatment as well.

ETA: Just found out the "milspec" buffer tube from may (partially) be to blame; it's about 1/8-3/16" too shallow and does not appear to allow the bolt the same complete rearward travel as a BCM A5, Vltor A5, or any of the other milspec carbine receiver extensions I have.

ETA 5/26/19: 50% failure to pick up next round with A5H2. Runs like a champ with intended "H" and milspec carbine spring in DD lower. Fed Swiss 223, Win OTM, German MEN and Black Hills. Passed limp-wrist pistol test and spat out brass at 3:30 6 feet out. Must've had the original, smaller gas port spec (Roy @ WeapOutfitters had talked about differences in gas port spec).

[Pappabear]

I've got 3 of these barrels

2x will feed everything and lock back when using a standard BCG, A5H2 buffer and Springco Green using - 77gr BH reman 223, 77gr BH red box 5.56, 62gr TSX BH, MEN 56gr, Win 62gr OTM

Just finished the last one and went standard Carbine buffer system for a change. H with Blue Springco and it wouldn't cycle the Win OTM on its intial outting. Looks like that will receive the A5 treatment as well.

Copy that, A5 may be the perfect remedy.

PB

[GH41]

My question... Where are you finding M855A1? Only thing I am seeing is fairly small quantities at ridiculous prices.

[Clint]

Have you measured the ports on those barrels?
There may be two sizes.

Also, isn't the win OTM quite hot?

I've got 3 of these barrels

2x will feed everything and lock back when using a standard BCG, A5H2 buffer and Springco Green using - 77gr BH reman 223, 77gr BH red box 5.56, 62gr TSX BH, MEN 56gr, Win 62gr OTM

Just finished the last one and went standard Carbine buffer system for a change. H with Blue Springco and it wouldn't cycle the Win OTM on its intial outting. Looks like that will receive the A5 treatment as well.

[ggammell]

I thought "weaker" rounds were supposed to shoot higher. Based on what I've read, because it takes fractionally longer for the round to leave the muzzle, the barrel will be pointed fractionally higher due to muzzle rise.

The bullet has left the barrel long before any recoil. What you’ve read is incorrect.

[WS6]

The bullet has left the barrel long before any recoil. What you’ve read is incorrect.

This is true in m4, but he is correct in the heavy revolver world, except he got it backwards.