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Picture of how to make a pipe door spring gun
intro: a spring gun in this case is a spring powered launcher not the other kind as said on this article http://en.wikipedia.org/wiki/Spring-gun  weapons is a age-old, time-honored tradition passed down from gernation to gerneration to preverve the spirit of father to son sportsmanship 
to give something to have a adventure in reponsiblity
   also THE AUTHOR WHO OWNS THE IDEA WHO  INVENTED IT,DISIGNED IT AND THOUGHT OF THE IDEA AND IF THIS WEAPON IS USED INA OFENSE AUTOMATICLY COUNTS TO THE PERSON WHO IS USING THIS PIPE DOOR SPRING GUN IS THE ONLY ONE  HELD  REPONSIBLE IS THE PERSON WHO USED THIS PIPE SPRING GUN FOR THE USE,. THE AUTHOR CAN NEVER TAKE ANY REPONSIBLITY WITH ANYTHING DONE WITH THIS UNLESS IT WAS THE AUTHOR IN ANY WAY,SHAPE OR FORM INCLUDING LAWSUITS THE AUTHOR DOES NOT KNOW THE LAWS OF EVERYWHERE PLEASE USE THIS REPONSIBLY AND THIS ONE IS DIFFIENT FROM THIS ONE http://www.instructables.com/id/Make-a-simple-Spring-Powered-Cannon/
IN FACT THIS PIPE DOOR SPRING GUN CAN BE MORE POWERFULL ALSO THIS IS VARYS OF AGE APPROPRATE FOR DIFFRENT AGES DEPENDING ON THE AREA THIS IS MEANT FOR A REPONSIBLE MANNER WHICH IS APROPRATE IN TARGET PRATICE FOR PAINTBALL GAMES SECOND OF ALL THIS IS FOR KIND USE ONLY JUST SO YOU KNOW THAT IS NOT MEANT FOR ANY REASONS OF THIS ARTICLE GETTING REPORTED IN FACT THIS CAN BE A POWERFUL THIS IS NOT A TOY USE AT YOUR OWN RISK HOW EVER YOU CAN USE THIS FOR PAINTBALL GAMES THE AUTHOR DOES NOT FRECOMMEND TO GIVE THIS TO ANY ONE UNDER THE AGE OF 8 YEARS OLD AND WITHOUT SUPERVSION AGES 13 AND UP THIS DISCLAIMER COVERS ANY REASONS OF WHY PEOPLE WOULD EVER TRY TO REPORT A WEAPON •SAFETY AND PROPER  WEAPON HANDLING ARE THE RESPONSIBILITY OF EVERY SHOOTER 
THIS WAS MADE,INVENTED BUILT AND DISIGNED IN A AREA WHERE ALLOWED TO LAW AND IS FOR USE WHICH IS ALLOWED IN CITY AND COUNTY USE SUCH AS TARGET PRATICE,TO CALCULATE THE FIREPOWER TO FIND OUT THE LAWS AND TO PROTECT HUMAN LIVES.THIS HAS SEROIUS POWER ENOUGH TO CHIP A PLASTIC BOTTLE CAMP AND THE AMMO AND MAKE IT FLY AT LEAST 2 YARDS
to make a pipe door spring gun you will need
 a 1 inch diamiter plumbling pipe that's 1 foot long,twine,a adjustable door extension coil spring the same kind as shown in the picture below you a other thing you need ammo that fits inside a 1 inch pipe or a 68 caliber projectitle you another thing you need is a cordless drill with charged batterys and a drill bit  and finally you need line man's pliers
 
FOR AMMO
the author recommends glue sticks and is not refering to the kind in hot glue guns   i also apolagize that you can see the camera man THE FIRST MEASURED AMOUNT OF FIREWPOWER BY THE AUTHOR   
  my pipe door spring gun shot 11.88 meters with a 8 gram projectitle sorry about the prevous ones if i miscaluclated however this one is the real trajectory and this time the author has added the total unit before converting which is= to 1.129075125954904 joules and in fact it is so powerful compared to in canada it only takes it to be more than 5.7 joules of energy and more than 500 feet per second for it to be a firearm in canada
OTHER INFO
and the camera in the images in this case the camera is a nentedo dsi
 
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Step 1:

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unscrew the other springs of the door spring and then tie one  simple overhand knot to the diangnal loop. then a overhand tie it again to secure it to be sure it it will not go and slip off then now to drill one hole into the plumbling pipe.then  useing the twine tie the twine to the pipe then tie another knot to secure it keep in mind if you cannot pull the knot to tie the knot then you can use the pliers to assist tieing the overhand knot

Step 2:

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now just tie a overhand knot from the spring then tie again

Step 3:

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then tie a overhand knot to secure the twine to the pipe while keeping in mind to never get it too deep and never too shallow you want it to fit the projectitle's length it should be 3/12th as deep as the size of the plumbling pipe is long and the spring should be 1/12th longer than the plumbling pipe

Step 4:

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now your done just slide in the spring into the pipe then you load it up by inserting a item into the front of the plumbling pipe and onto the machanical spring.then to grab the pipe and then point the front of the pipe towards the target to aim then pull back the spring and to shoot just let go. then if your spring is sprung out of the pipe just slide it back into the pipe then repeat it again for the next shot now remember if you are using paintballs use 68 cailber paintballs just keep in mind not to pull to hard otherwise the string will snap and that includes just pulling then twisting and then let go or just pulling on it's own too much now if it does snap just restart starting at step2

Step 5: Tips,advise and recommendations

Picture of tips,advise and recommendations

tips,advise&recommendations
 
#1 when carrying: wear a bolt snap that you can attach to your belt until you are ready to use
#2 the ammo should always touch the spring
#3 if the knot seems lose untie and retie it again
#4 to be more acturate which will prevent someone from acadently get shot to prevent this just pratuice the more acurate the less likely it is for a acadental shot to happen however you still could if you do it on proupose so be carefull remember the author is not reponsible for nay thing done with this unless it was the author that did it
#5 if you get your pipe door spring gun near germs take unite it and disinfent the plumbling pipe and if have disinfectants that is made for metal use it on the spring
#6 if it starts to rust use rust remover remember rust remover is posionnous so please do not have it near food,beverages,animals or small kids under 8 years old be near it
#7 if you get a spider in your pipe door spring gun take it apart then huamanely remove it and give it to someone who will take care of the spider or you can just release it into the oudoors and possably if it is weak enough you can play a game of shoot the spider which is simlar to hunting execpt it's not hunting
#8 if you are aiming with your eyes the author extermely advises you wear eye protection unless the spring is not directly pulled by towards your eye of the back of this pipe door spring gun in that case it should be between the chest you can also do other spots to pull the spring towords, the cheek,below the face,or comnpletly with your limbs, and hands
#9 a good projectitle for the back yard is a 8 gram glue stick and i am not refering to the hot glue gun sticks,
#10 never leave it out to rust
#11 do not tie it too lose
#11 use string to tie it if your does snap next time use weed wacker cord,string, or twine like nylon,polyelythele,pvc,kite string,household string