The AR Platform is probably THE most modular of long gun’s out there. There seems to be no end of parts, upgrades and do-dads available for it.
While there are MANY people out there with the armoring know how to replace their own parts or upgrade/repair their AR’s, there are others who are a little hesitant to take punches to their “baby” and get to work.
This post is to show how easily one can replace the bolt catch on their AR…it’s nothing to be scared of.
Today my Seekins Precision Enhanced Bolt Catch arrived. It offers a larger “paddle” for bolt manipulations, has a textured pattern for positive control and…yes…I thought it looked cool. IMO, if it works as well (or better) than OEM then I have no problem with making a choice based on appearance.
Anyway. First thing you should do is get your work-space prepared.
For this job all you need is two 3/32″ punches, a hammer and some tape.
After securing your lower in whatever block/vice you have, I suggest a layer or two of non-marring tape around the area you are working on to protect the surface from any scratches.
Using a 3/32″ punch and hammer, slowly tap the roll pin securing the bolt catch out.
Since this is a replacement job I recommend not driving the roll pin all the way out. Just tap it till the old bolt catch can be removed. Be sure to retain the bolt catch spring and plunger for re-installation.
Now it’s “in with the new”. Push the spring back into the receiver, followed by the plunger.
Now, temporarily secure the new catch by pushing a second 3/32″ punch through the flange on the lower receiver and the hole in the catch.
Then all you have to do is simply reverse the process by tapping the roll pin back into place.
Someone explain it to me. I don’t drink his kool-aid, but I don’t hate the guy’s stuff either. Is it jealousy of his success? Is this some sort of “sell-out” thing, like some folks point at musicians when they go commercial? Sure, this video is a tad loopy, but it’s Airsoft in Japan and they wanted him to do this for a photo-op.
I see a lot of OMG HE’S FLAGGING PEOPLE WITH A GUN!!! going around. But it really looks like he’s pointing over everyone’s head at the far wall. And correct me if I’m wrong, but people actually point and shoot Airsoft at each other all of the time don’t they?
What’s the story with the hate on this dude? He’s certainly bought the AR platform some attention.
I have seen, practiced and even operationally utilized some two man movement techniques similar to these but they sometimes left me thinking about the wisdom of them.
I can see the utility in “nuts to butts drills” when used doing building clearing and other situations where you need to maneuver in tight quarters and keep a 360 deg security. Similarly I can see their advantages as immediate reaction drills where you make contact while in a stack or while approaching a scene/suspect with a partner close by.
William of Ockham was an influential medieval philosopher who is recalled chiefly for the maxim attributed to him known as Ockham’s razor. Also spelled “Occam’s Razor”. The words attributed to him are, entia non sunt multiplicanda praeter necessitatem…or “entities must not be multiplied beyond necessity”.
I bring this up because I have just read a quote from the Dokkodo, the “The Solitary Path”, which is a short piece written by Miyamoto Musashi shortly before his death:
Do not collect weapons or practice with weapons beyond what can be of use to you.
I see a link between the philosophies of these two men and an application to weapon training. I will attempt to explain.
Debate points that always seem to come up when discussing emergency reloads are:
“I use the power stroke because I may be using a weapon I am unfamiliar with and running the slide is fairly universal for all pistols while slide releases may vary.”
“I use the power stroke because the actions are similar to the manual of arms for clearing malfunctions.”
Being a fairly recent convert to the slide release method, Occam’s and Musashi’s quotes kind of cut me both ways.
I argue that the “It’s universal for all pistols” point either means you own too many pistols or you are saying you are going to be doing a combat pick up of a pistol…or a disarm.
Per Occam/Musashi…if you have so many different pistols that you may/may not be carrying at any one time, you are violating their precepts. I’m not against collecting guns, I’m not against having different pistols/rifles for different applications, but if you worry that you may not be able to “auto pilot” your weapon because you may be carrying something different on any given day, that’s a problem IMO. Pick one and make it a part of your hand.
The combat pick-up/disarm argument doesn’t hold much water for me either. I’m probably not going to disarm an attacker of his weapon and magazines and have to do an emergency reload with them. And the combat pick-up is such a statistically rare issue that I don’t see it as a valid point. Either way, if they worry you then do the power stroke method if that ever happens.
The second point…”I use the power stroke because the actions are similar to the manual of arms for clearing malfunctions.” Is a more valid argument when applying Occam (Musashi doesn’t really apply here). Having one way of operating the pistol regardless of reason (malfunction or running dry) is a stronger point IMO and I have much to agree with.
However I would counter that Occam said “…must not be multiplied beyond necessity” he didn’t say “never multiply”. The slide stop method has some things going for it; speed, efficiency, the weapon/hands stay more oriented to the threat, etc. The necessity of multiplying your manual of arms to gain those advantages may be debatable, but I would debate it.
Either way you choose I find Occam and Musashi’s points as interesting ways to analyze our choices when it comes to weaponcraft. What do you think?
Three days ago an article was dropped onto the internets by the Washington Times that rippled through the time space continuum of internet commandos and pajama ninjas. The article was a series of interviews with former and active high ranking officials, as well as former service members regarding the reliability and efficacy of the longest serving weapon system (rifle or carbine) in US Military history. We do not need to address that storied history here, however we do need to address the concerns raised in the article and the already common ways they have been addressed and remedied.
Rifling twist rates can be another head scratcher for the new AR owner. The internet is full of different opinions of what is “best”…often times based on what the writer has purchased and is now trying to justify. 🙂
Like any topic of a technical nature, “best” is a relative term. For the beginner, what you need to learn are some simple rules of thumb to help you base a decision on.
Gun makers realized rather quickly that the accuracy of a firearm improved when the projectile had a “pointy end” and was spun. The “point” gives the projectile a streamlined shape that slices through the atmosphere more efficiently and groves machined into the gun barrel impart spin. The spin keeps the bullet stable along its path of flight and prevents it from wobbling or tumbling end over end, both of which would be bad for accuracy. Anyone who has used a gyroscope in HS science class recalls that a spinning object likes to stay in one place and resists change. That’s what you want in a bullet.
The groves in the barrel, as we all know, are called “rifling”.
A rifle barrels rate of spin is expressed as 1:(X) with 1= “One full 360 degree rotation of the bullet” and X= Inches of barrel length.
The most common “Combat AR” twist rates you will find “off the shelf” these days are 1:7, 1:8, and 1:9. Some AR owners like 1:10 and 1:12 barrels and other variants, but in my experience you will find most guys who “run and gun” using one of these three.
If you do the math of dividing barrel length by twist you see that in the common 16″ barrel length a 1:7 twist will spin a bullet twice with 2 inches of the barrel still to go. A 1:8 about twice even, and a 1:9 will spin it once with 7 inches of barrel to go…so “almost twice”. Based on manufacturing variations that’s all approximate but there you go.
So “whats the point?” you are asking?
Well… bullets of any given caliber (AKA: diameter) come in various sizes. Differentiated by weight (measured in “grains”), there is an entire rainbow of .223 caliber bullets ranging from tiny 40 grain bullets up to 80 grain whoppers. Because the diameter of the bullet is fixed, what you get are longer projectiles as the weight increases.
Rules of thumb regarding bullet weight:
Lighter bullets can achieve faster velocities and shoot with a flatter trajectory. Their lack of mass means they wont stay stable at longer ranges and wind has more effect on them at long range.
Heavier bullets will stay stable over longer distances but have a more “arched” trajectory. Wind has less effect on them at long range.
The terminal effect of a bullet, or its “striking” power, is due to a combination of it’s mass and velocity.
Heavier bullets cost more.
Like barrels, for the purposes of discussion I will use the three most common (as I see it) bullet sizes; the highly common 55 gr, the “medium” 69 gr and the “large” 75 gr.
Due to a lot of math/physics and stuff I can’t explain, it’s really the length of the projectile and it’s velocity that determine how much spin it will need to fly straight and stable, not the weight. However, we talk about bullets in “grains” so when pairing bullets to rifling twist you just have to consider two facts.
Lighter bullets need less spin to get them into a stable flight.
Heavier bullets need more spin to get them stable in flight.
So..1:7 is 2 full twists plus a little more out of a 16″ barrel which means MORE TWIST and a 1:9 is 1 full twist which means LESS TWIST. The 1:8 splits the difference.
You would think that “more is better” when it comes to twist, but what happens when small/light bullets are overspun is that they fly to pieces once they exit the barrel. Heavier bullets will “overstabilize” if spun too much. That means the point of the bullet wont come down on the decent end of it’s trajectory.
So which should you get? Well what do you want to do and what size bullet do you want to do it with?
The 1:9 is a common twist rate “off the shelf” when you buy an AR. It will work fine with the commonly found 55 grain bullet up to “medium” sized projectiles like 69 grain. Depending on your particular barrel it MAY even stabilize “heavy” bullets…or it may not. Even if it does, variations like temperature and air pressure MAY make it inconsistent with heavy rounds. So out to 300 yards or so 1:9 should be fine. 400-500 yd shots? Probably not so much.
The 1:7 is the current military standard on the M4/M16 and as such is also a commonly found option. It will throw the medium to heavy rounds out past 300 yards. It can also “sufficiently” stabilize 55 grain rounds. You wont get exceedingly small groups with 55gr, and while it MAY stabilize a lighter round for farther shots, you are also at the mercy of your individual barrel and environmental factors.
The 1:8 slides the options to the center. Some praise it as the best of both worlds while others deride it as the “Jack of all trades, master of none” option.
As you can see, in the end all of them can work fine as a general use option. It’s when you want to specialize in a specific range or hunting environment that a specific combination of bullet/twist becomes the optimum choice.