Monday, November 17, 2008
I recently created a rifle ballistics program that is simple to use and has proven to be very accurate. The ballistic calculations are based on the formula's of Arthur Pejsa. If you Google him you will find his website and book on the topic. The topic intrigued me, and because I am a Java guy, I decided to code some things up. Anyhow, all you need is some basic imput information like muzzle velocity, bullet weight, and the bullet coeficient (BC). From there I can tell you your point of impact starting from zero out to over 1000 yards. I can also show you your muzzle velocity, flight path, etc. I even built in a "range card" feature that creates a printable table complete with the number of MOA to adjust your scope. You can find the BC of your bullet by looking on the manufacturer's website. For instance I had some Black Hills .223 Match Ammo. When I looked it up on the website they gave me the muzzle velocity, and spec'd the bullet as a 69gr. Sierra Matchking. I went to Sierra's website, and they provided the BC. I shot this ammo out to 600 yards a few weeks ago, and the program was dead-on. Check it out here: GenXApps.com
Sunday, January 21, 2007
I uploaded them to YouTube, here they are:
AR-15 Field Strip
AR-15 Bolt Carrier Dissasembly
AR-15 Bolt Carrier Assembly
Thursday, January 18, 2007
In this post I will try and provide my interpretation (in plain English) of the current Connecticut gun laws surrounding the AR-15 type rifle. I am in no way a lawyer, and although I believe these statements to be accurate, you must check with your local authorities before purchasing or obtaining a firearm.
Now that we got the disclaimer stuff out of the way, let's start with a little background information.
We are going to focus on the AR-15 type rifle. Most people will immediately notice it's resemblance to the M-16 automatic rifle like which was carried in Vietnam. The M-16 is an "automatic" rifle . By automatic, we mean you press the trigger and it continues to shoot until you let off, or the ammo runs out. In Connecticut, it is illegal to have an "automatic" weapon of any make or type (see notes for exceptions), it is also illegal to have a weapon which can readily be made into an "automatic" , or to have parts to make a weapon into an "automatic".
The original Colt AR-15 was a "selective fire" rifle (more on that later). Today, several manufacturers produce AR-15 spec rifles with the exception that they are semi-automatic only. In the case of a "semi-automatic" rifle, you squeeze the trigger, and one round is fired. You then need to let off the trigger and re-squeeze it to fire another round. These manufacturer's include:
Rock River Arms
In Connecticut, it is also illegal to have a "selective fire" weapon meaning the user can select different firing options including:
Automatic fire (see above)
Burst fire (typically this is a 3 round burst with a single pull of the trigger)
Semi-automatic fire ( one round per squeeze)
Any weapon which allows you to select different firing modes is considered an "assault weapon", and is not legal to have in your possession in CT.
It is also illegal to own any of the following specific firearms determined to be "assault rifles":
Australian Automatic Arms SAP Pistol
Auto-Ordnance Thompson type
Avtomat Kalashnikov AK-47 type
Barrett Light-Fifty model 82A1
Bushmaster Auto Rifle and Auto Pistol
Calico models M-900, M-950 and 100-P
Chartered Industries of Singapore SR-88
Colt AR-15 and Sporter
Daewoo K-1, K-2, Max-1 and Max-2
Encom MK-IV, MP-9 and MP-45
Fabrique Nationale FN/FAL, FN/LAR, or FN/FNC FAMAS MAS 223
Feather AT-9 and Mini-AT
Federal XC-900 and XC-450
Franchi SPAS-12 and LAW-12
Galil AR and ARM
Goncz High-Tech Carbine and High-Tech Long Pistol
Heckler & Koch HK-91, HK-93, HK-94 and SP-89
MAC-10, MAC-11 and MAC-11 Carbine type
Intratec TEC-9 and Scorpion
Iver Johnson Enforcer model 3000
Ruger Mini-14/5F folding stock model only
Scarab Skorpion SIG 57 AMT and 500 series
Spectre Auto Carbine and Auto Pistol
Springfield Armory BM59, SAR-48 and G-3
Sterling MK-6 and MK-7
Street Sweeper and Striker 12 revolving cylinder shotguns
UZI Carbine, Mini-Carbine and Pistol
Weaver Arms Nighthawk
Wilkinson "Linda" Pistol
OK, so know we understand that we can't own an automatic or selective fire weapon in CT, so that means we just need to find a semi-auto only version from any of the manufacturer's and we are legal right? Wrong!
We also need to be concerned with some specific banned "features". These features are typically referred to as "pre-ban" features, as they were identified an outlawed in the Federal 1994 Crime Bill. Connecticut lawmakers then passed state law that was based on the 1994 Crime Bill. Although the Federal 1994 Crime Bill has since sunset, the CT laws have not.
What are these "pre-ban" features you ask?
a) a folding or telescoping stock
b) a bayonet lug
c) a threaded barrel end
d) a flash suppressor
e) a grenade launcher
This means, that if you want an AR-15 style rifle, by default it will have a detachable magazine, and a pistol grip, therefore you hit the CT legal limit of features on that rifle. Anything else makes it an "assault rifle". That means you can't have that a 6 position tactical stock that collapses, you can't have an upper assembly that has a bayonet lug, flash suppressor, etc.
What can you have? You can have something with "post-ban" features like the AR-15 pictured on my blog. My AR-15 is actually built from a Stag Arms lower receiver, the complete lower was built by Stag Arms, and has the ability to shoot in semi-auto mode only, and came with a stock looks like a tactical telescoping unit, but in fact is fixed. My DPMS upper has a "Bull Barrel" which means it doesn't have any flash suppressor or muzzle break attached. It also doesn't have a bayonet lug, or grenade launcher either, therefore it is legal in CT.
I should mention that you can own an AR-15 with a "muzzle break" which looks a lot like a flash hider, but it must be permanently attached i.e. welded, and not threaded on to the end of the barrel.
A few comments about the exceptions to owning automatic weapons. There was a time in which if you owned an automatic weapon, you could register it with the state and it would still be legal to own to this day. That time has gone, it is now illegal to own one unless it has been properly registered some time ago.
In respect to the exceptions on owning "pre-ban" weapons. It is legal to own a "pre-ban" rifle if and only if it was completely built prior to September 13th 1994. This means the entire rifle as a whole was 100% assembled and complete at this date, in addition you will need paperwork to prove this. There is a large misconception out there, that a person can purchase an AR15 lower that was built prior to September 13th, 1994 and add a pre-ban upper. This is definitely not legal. Owning anything other than a completed rifle built prior to Sept 13th 1994 with these features is not legal. If you do come across a "pre-ban" for sale, you will pay a large premium for the rifle, as well as want to see the documentation proving it was a complete rifle prior to 9/13/1994.
Monday, January 15, 2007
We had 4 different .223 AR's, an Alexander Arms .50 cal Beowulf upper on an AR-15 lower, and a few other pieces too.
Check out the magazine loaded with the beowulf rounds! The upper takes a standard magazine, which accepts the special .50 caliber round necked down to a .223
I shot some really great groups with my AR. The scope dialed in nicely, even after removing it from the A.R.M.S. # 36 extended rail to clean after my sight-in on Saturday! The A.R.M.S. #22 throw lever rings and rail combination returned the scope to zero within a 1/4 MOA.
Sunday, January 14, 2007
It was close, but we needed to move the scope forward about a 1/4". The AR went back into the vise, where we loosened the rings and moved the scope up. A little bit of tension again, and we removed the rifle and re-checked. The eye relief was perfect this time, so it went back into the vise.
After adding a small drop of Blue loctite to each of the rings screws. I slowly tightened each screw a 1/4 turn at a time. This needs to be done like you would a valve cover on an engine block in an alternating fashion (see figure 1) .