Special Interest Arms - FAQ
Special Interest Arms

Enfield .45 conversion's.

Assembly of the .45 acp is very straightforward, but will require a couple of steps that may be somewhat difficult for individuals who are not trained gunsmith's.

1. Due to inevitable minor variances in Enfield actions we cannot fully head space the barrel and bolt before delivery to the customer.
Final head space has to be done after the barrel is trial fitted on the buyers original receiver.
For the new style lock-nut barrels the chamber is fully reamed to size.

2. The extractor notch will have to be cut in the chamber end of the barrel. This can be done on a milling machine, or by hand using a Dremel® tool or sharp square file.

An Enfield receiver vise and barrel wrench are STRONGLY recommended for use in building the .45 conversion.
Poor quality improvised tooling can easily ruin the Enfield action!

S.I.A. cannot take responsibility for any conversions that we do not build as we have no control over others quality.
If in doubt of your abilities please seek the help of a qualified gunsmith.

* There is no need to send us your old barrel, we supply one of our new replacement barrels as a standard component.

How do I get my old barrel off? It's REALLY stuck!
 Seven out of ten Enfield barrels are extremely hard to remove, we find that the easiest way to get them off the action is as follows. If you do not have a lathe, a local machine shop or gunsmith can handle this for you at a nominal cost.
A. Strip the action of the stock, rear sight, and all small parts which might come loose while the action is spinning in a lathe.
B. Strip the bolt assembly, you will need a firing pin removal tool.
C. Insert the bolt body into the barreled action.
D. Mount the barreled action in a lathe with a "swing" of 9" or larger.
E. At the receiver end place the firing pin hole in the bolt body on a live center mounted in the tail stock.
F. Chuck the barrel in a self centering three jaw chuck.
G. At very low speed turn-off the barrel shoulder (Chamber area just in front of the receiver) to 1" diameter using a thin blade parting tool. Wear safety glasses!
H. This will relieve pressure on the barrel shoulder and threads, the barrel should now unscrew easily.
Since the barrel shoulder has been machined back the barrel is now scrap, and will never be usable in .303 again.

·  Why use the Enfield No. 1 Mk. III or No.4/5 as a donor?

·  The Enfield is reasonably inexpensive as a donor gun, it has a strong and well proven action, It also has a factory detachable magazine, so converting to our 1911 Mag. adapter is relatively simple.

·  Where should I look for an Enfield to use for conversion?

·  Enfields have been imported in large numbers over the last few decades. Many of them can be found already "sporterized" at gun shows, pawn shops, or garage and estate sales.
 Many gun shops will have a couple of Enfields on hand, try to buy a gun you can examine in detail before purchase. Since you intend to replace the barrel you may get a gun cheap if it has a poor bore.

·  Why not use another gun, like a Mosin-Nagant or Persian Mauser?

·  Those guns are more difficult to do, and would end up being more expensive.
The Mosin-Nagant has a too narrow magazine well, the Mauser has a floor plate and internal magazine. Besides, I like Enfield's!

·  Aren't you destroying valuable collector guns?

·  No, the guns to convert have little or no collector value. They are usually previously modified, sourced from foreign military surplus, or they have been "FTR" and then sold to third world countries by the shipload.

·  What made you decide that there is a market for these guns?

·  We had a retail gun store, several customers came in looking for a bolt action rifle in 7.62x39 or another inexpensive round.
The only guns available were Ruger ® and CZ ® rifles, with high retail prices and fixed magazines.

·  These prices defeated the purpose of many of the customers, they wanted a gun that was inexpensive to buy, accurate, cheap to shoot, in a caliber suitable for deer or pig hunting, which also used detachable magazines.

·  Can I change my gun back to .303 British?

·  Not easily. The receiver is not modified, but the barrel and bolt head would haved to be replaced.

·  How powerful is .45 acp and 9mm, how far can I shoot accurately with the converted gun?

·  .45 acp is excellent on game up to deer size, it is very accurate to 70 yards, and reasonably accurate to 150 yards. It will reach much further, but hitting a target at long range will take more skill.
9-mm is similar but ballistics will change with bullet weight, velocity, and barrel length.

·  Can I put a scope on my converted Enfield?

·  All standard Enfield accessories will work with our pistol caliber conversions.
We suggest a 2.5-8, 4X or 6X scope in 32-40mm objective lens.

·  What magazines fit the Enfield .45?

·  Any 1911 magazine of good quality should work fine.

·  Many states also limit hunters to a 5 rd. magazines, others have bans on magazines holding over ten rounds.
The short magazine from the AMT "Back-up" .45 fits our adapter very well.

·  Letting the customer order 1911 mags saves us from having to keep track of which states allow the mags we want to supply with each gun.

·  What scope mount works best?

·  Our own, of course! ;-) The lowest possible mount, featuring a "Picatinny" rail and a "U" notch so that original sights may be used without removing the scope base. Available for No. 1, Ishapore 2A, and the No. 4 or No. 5 Enfields.
These mounts allow the rear vernier site of a No. 4 or No. 5 Enfield to remain on the gun during use!

·  Is the completed conversion still a C&R gun?

·  Under our understanding of the law it is not.
Terms of sale.

    All sales will comply with all state and federal laws.

    Payment by Money Order or Bank Check is preferred, personal check are accepted but may delay shipment while they clear our bank.
Credit card payment only by phone, 3% loss of cash discount applies.

    After verifying availability send payment to the address listed on our current order forms.

  Please do not send an order without contacting us first!

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