Maccabee Defense SLR information and updates

zxcvbn said:
Since I know very little about building rifles this is probably a dumb question :redface: Anyways, I have read most of the posts and used the search function on the thread (googled too) but see no mention as to whether there are M4 feed ramps cut into the receiver. Is that the case?
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Anybody?
 
Ok thanks. But I get the sense people are ordering barrels or have a barrel for this receiver set. Isn't it necessary to know the answer before one can plan on a build? Serious question.
 
zxcvbn said:
Ok thanks. But I get the sense people are ordering barrels or have a barrel for this receiver set. Isn't it necessary to know the answer before one can plan on a build? Serious question.
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Are you shooting full auto out of an M4 with the associated cyclic rate and gas pressures using worn magazines?

From another forum...

"LaRue mfg, is arguing against the use of M4 feed ramps in most situations. For the vast majority of applications A3 (standard) feed ramps are recommended.

LaRue's reasoning is thus - -
The M16 soldiered on for many years before the development of the M4 and the feeding problems that ensued. The reasons that Says LaRue -
Shortly after the M4 was adopted, the Army found that the already high gas pressures from the short, carbine-length system created unreliable feeding when fired on full auto from worn magazines (which are supposed to be a disposable item, but we all know better.). It seems that when the M4 is firing at 700-950 RP that the higher pressure curve cycles the bolt so quickly that the next round in the magazine doesn't have time to come all the way up on the magazine before it is struck by the bolt. The M4 ramps are cut deeper to begin picking up the round faster. There are three initial criteria needed to make the M4 feed ramps necessary; a carbine-length gas system, high cyclic rate full auto fire (700-950), and worn magazine springs.

The opening of the barrel extension is fixed, the feed ramps cannot simply be extended closer to the magazine. The only remedy is to cut them deeper, and steeper. M4 ramps are 17-degrees steeper than A3 ramps. When a bullet is cycled from the magazine, the angle that the bullet contacts M4 ramps closer to the tip and at a steeper angle than on A3 ramps. This could have a detrimental affect on accuracy and reliability on your AR."

I'm not building a carbine M4. So I'm not too worried. M4 fees ramps aren't essential. Some of my builds have them, some don't. Never noticed a difference.
 
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Haha no full auto. My question was directed at which barrel to buy. I'm looking at a Faxon. The description says: "Barrel Extension: M4". I read somewhere that one should make sure the barrel and receiver matches properly with respect to feed ramps. Thanks for the info though. Interesting.
 
zxcvbn said:
Haha no full auto. My question was directed at which barrel to buy. I'm looking at a Faxon. The description says: "Barrel Extension: M4". I read somewhere that one should make sure the barrel and receiver matches properly with respect to feed ramps. Thanks for info though. Interesting.
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This is a legitimate question and I would like to know as well. We want to know if the receiver has rifle or M4 feed ramps. He didn't ask and doesn't care about what LaRue thinks
 
Will the Odin 18.6” stainless 223 Wylde barrel work on the receiver set as far as feed Ramps go? I don’t wanna order the wrong parts. I’m already an ar-15 newb as it is
 
fenceline said:
Are you shooting full auto out of an M4 with the associated cyclic rate and gas pressures using worn magazines?

From another forum...

"LaRue mfg, is arguing against the use of M4 feed ramps in most situations. For the vast majority of applications A3 (standard) feed ramps are recommended.

LaRue's reasoning is thus - -
The M16 soldiered on for many years before the development of the M4 and the feeding problems that ensued. The reasons that Says LaRue -
Shortly after the M4 was adopted, the Army found that the already high gas pressures from the short, carbine-length system created unreliable feeding when fired on full auto from worn magazines (which are supposed to be a disposable item, but we all know better.). It seems that when the M4 is firing at 700-950 RP that the higher pressure curve cycles the bolt so quickly that the next round in the magazine doesn't have time to come all the way up on the magazine before it is struck by the bolt. The M4 ramps are cut deeper to begin picking up the round faster. There are three initial criteria needed to make the M4 feed ramps necessary; a carbine-length gas system, high cyclic rate full auto fire (700-950), and worn magazine springs.

The opening of the barrel extension is fixed, the feed ramps cannot simply be extended closer to the magazine. The only remedy is to cut them deeper, and steeper. M4 ramps are 17-degrees steeper than A3 ramps. When a bullet is cycled from the magazine, the angle that the bullet contacts M4 ramps closer to the tip and at a steeper angle than on A3 ramps. This could have a detrimental affect on accuracy and reliability on your AR."

I'm not building a carbine M4. So I'm not too worried. M4 fees ramps aren't essential. Some of my builds have them, some don't. Never noticed a difference.
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the bullet touches the feed ramps?
or did you mean the case?
 
Keodis said:
This is a legitimate question and I would like to know as well. We want to know if the receiver has rifle or M4 feed ramps. He didn't ask and doesn't care about what LaRue thinks
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He asked if M4 feed ramps matter. I gave him an answer.

Before you scream about M4 feed ramps... ask why M4 feed ramps were needed... and if that full auto carbine running worn out mag in combat solution meets the needs of your rifle.

Up next... is the barrel chrome lined... and are the SLR rifles milspec...
 
Keodis said:
This is a legitimate question and I would like to know as well. We want to know if the receiver has rifle or M4 feed ramps. He didn't ask and doesn't care about what LaRue thinks
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Correct me if I'm wrong but it's the barrel extension that has the feed ramps no? So that would depend on your barrel.
 
r34skyline said:
Correct me if I'm wrong but it's the barrel extension that has the feed ramps no? So that would depend on your barrel.
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M4feedramps_zps26190408.jpg
 
r34skyline said:
Correct me if I'm wrong but it's the barrel extension that has the feed ramps no? So that would depend on your barrel.
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They are talking about the receiver having the M4 feed ramp extensions milled into it.

My point was you don't need m4 feed ramps to run effectively. Rifle setup will work fine.

That being said as pointed out by koeadibyo... M4 ramps with a rifle extension would be less desirable. The other 3 options I've never had issues with.
 
koesdibyo said:
M4feedramps_zps26190408.jpg
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fenceline said:
They are talking about the receiver having the M4 feed ramp extensions milled into it.

My point was you don't need m4 feed ramps to run effectively. Rifle setup will work fine.

That being said as pointed out by koeadibyo... M4 ramps with a rifle extension would be less desirable. The other 3 options I've never had issues with.
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Got it. Thank you. I was a bit confused there. I too am curious about this now.
 
bananarama said:
...because the bullet touching the ramp is a very undesirable situation
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...and completely unavoidable when, not if, it does. One of the reasons why I crimp my hand loads.

Want a taste of what your ammo is doing from mag to chamber? Have a look at the slow motion footage LAV does on his firearms reviews.
 
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